mirror of
https://github.com/k3s-io/kubernetes.git
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419 lines
13 KiB
Go
419 lines
13 KiB
Go
// +build !safe
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// +build !appengine
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// +build go1.7
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// Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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package codec
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import (
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"reflect"
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"sync/atomic"
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"unsafe"
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)
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// This file has unsafe variants of some helper methods.
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// NOTE: See helper_not_unsafe.go for the usage information.
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// var zeroRTv [4]uintptr
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const unsafeFlagIndir = 1 << 7 // keep in sync with GO_ROOT/src/reflect/value.go
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type unsafeString struct {
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Data uintptr
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Len int
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}
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type unsafeSlice struct {
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Data uintptr
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Len int
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Cap int
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}
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type unsafeIntf struct {
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typ unsafe.Pointer
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word unsafe.Pointer
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}
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type unsafeReflectValue struct {
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typ unsafe.Pointer
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ptr unsafe.Pointer
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flag uintptr
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}
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func stringView(v []byte) string {
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if len(v) == 0 {
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return ""
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}
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bx := (*unsafeSlice)(unsafe.Pointer(&v))
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sx := unsafeString{bx.Data, bx.Len}
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return *(*string)(unsafe.Pointer(&sx))
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}
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func bytesView(v string) []byte {
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if len(v) == 0 {
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return zeroByteSlice
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}
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sx := (*unsafeString)(unsafe.Pointer(&v))
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bx := unsafeSlice{sx.Data, sx.Len, sx.Len}
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return *(*[]byte)(unsafe.Pointer(&bx))
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}
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func definitelyNil(v interface{}) bool {
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return (*unsafeIntf)(unsafe.Pointer(&v)).word == nil
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}
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// func keepAlive4BytesView(v string) {
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// runtime.KeepAlive(v)
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// }
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// func keepAlive4StringView(v []byte) {
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// runtime.KeepAlive(v)
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// }
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// TODO: consider a more generally-known optimization for reflect.Value ==> Interface
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//
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// Currently, we use this fragile method that taps into implememtation details from
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// the source go stdlib reflect/value.go,
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// and trims the implementation.
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func rv2i(rv reflect.Value) interface{} {
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if false {
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return rv.Interface()
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}
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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// references that are single-words (map, ptr) may be double-referenced as flagIndir
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kk := urv.flag & (1<<5 - 1)
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if (kk == uintptr(reflect.Map) || kk == uintptr(reflect.Ptr)) && urv.flag&unsafeFlagIndir != 0 {
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return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: *(*unsafe.Pointer)(urv.ptr), typ: urv.typ}))
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}
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return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: urv.ptr, typ: urv.typ}))
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}
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func rt2id(rt reflect.Type) uintptr {
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return uintptr(((*unsafeIntf)(unsafe.Pointer(&rt))).word)
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}
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func rv2rtid(rv reflect.Value) uintptr {
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return uintptr((*unsafeReflectValue)(unsafe.Pointer(&rv)).typ)
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}
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// func rv0t(rt reflect.Type) reflect.Value {
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// ut := (*unsafeIntf)(unsafe.Pointer(&rt))
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// // we need to determine whether ifaceIndir, and then whether to just pass 0 as the ptr
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// uv := unsafeReflectValue{ut.word, &zeroRTv, flag(rt.Kind())}
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// return *(*reflect.Value)(unsafe.Pointer(&uv})
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// }
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// --------------------------
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type atomicTypeInfoSlice struct {
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v unsafe.Pointer
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}
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func (x *atomicTypeInfoSlice) load() *[]rtid2ti {
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return (*[]rtid2ti)(atomic.LoadPointer(&x.v))
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}
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func (x *atomicTypeInfoSlice) store(p *[]rtid2ti) {
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atomic.StorePointer(&x.v, unsafe.Pointer(p))
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}
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// --------------------------
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func (d *Decoder) raw(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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// if urv.flag&unsafeFlagIndir != 0 {
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// urv.ptr = *(*unsafe.Pointer)(urv.ptr)
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// }
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*(*[]byte)(urv.ptr) = d.rawBytes()
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}
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func (d *Decoder) kString(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*string)(urv.ptr) = d.d.DecodeString()
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}
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func (d *Decoder) kBool(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*bool)(urv.ptr) = d.d.DecodeBool()
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}
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func (d *Decoder) kFloat32(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*float32)(urv.ptr) = float32(d.d.DecodeFloat(true))
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}
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func (d *Decoder) kFloat64(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*float64)(urv.ptr) = d.d.DecodeFloat(false)
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}
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func (d *Decoder) kInt(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*int)(urv.ptr) = int(d.d.DecodeInt(intBitsize))
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}
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func (d *Decoder) kInt8(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*int8)(urv.ptr) = int8(d.d.DecodeInt(8))
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}
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func (d *Decoder) kInt16(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*int16)(urv.ptr) = int16(d.d.DecodeInt(16))
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}
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func (d *Decoder) kInt32(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*int32)(urv.ptr) = int32(d.d.DecodeInt(32))
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}
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func (d *Decoder) kInt64(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*int64)(urv.ptr) = d.d.DecodeInt(64)
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}
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func (d *Decoder) kUint(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*uint)(urv.ptr) = uint(d.d.DecodeUint(uintBitsize))
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}
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func (d *Decoder) kUintptr(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*uintptr)(urv.ptr) = uintptr(d.d.DecodeUint(uintBitsize))
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}
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func (d *Decoder) kUint8(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*uint8)(urv.ptr) = uint8(d.d.DecodeUint(8))
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}
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func (d *Decoder) kUint16(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*uint16)(urv.ptr) = uint16(d.d.DecodeUint(16))
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}
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func (d *Decoder) kUint32(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*uint32)(urv.ptr) = uint32(d.d.DecodeUint(32))
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}
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func (d *Decoder) kUint64(f *codecFnInfo, rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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*(*uint64)(urv.ptr) = d.d.DecodeUint(64)
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}
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// ------------
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// func rt2id(rt reflect.Type) uintptr {
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// return uintptr(((*unsafeIntf)(unsafe.Pointer(&rt))).word)
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// // var i interface{} = rt
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// // // ui := (*unsafeIntf)(unsafe.Pointer(&i))
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// // return ((*unsafeIntf)(unsafe.Pointer(&i))).word
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// }
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// func rv2i(rv reflect.Value) interface{} {
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// urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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// // non-reference type: already indir
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// // reference type: depend on flagIndir property ('cos maybe was double-referenced)
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// // const (unsafeRvFlagKindMask = 1<<5 - 1 , unsafeRvFlagIndir = 1 << 7 )
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// // rvk := reflect.Kind(urv.flag & (1<<5 - 1))
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// // if (rvk == reflect.Chan ||
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// // rvk == reflect.Func ||
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// // rvk == reflect.Interface ||
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// // rvk == reflect.Map ||
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// // rvk == reflect.Ptr ||
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// // rvk == reflect.UnsafePointer) && urv.flag&(1<<8) != 0 {
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// // fmt.Printf(">>>>> ---- double indirect reference: %v, %v\n", rvk, rv.Type())
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// // return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: *(*unsafe.Pointer)(urv.ptr), typ: urv.typ}))
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// // }
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// if urv.flag&(1<<5-1) == uintptr(reflect.Map) && urv.flag&(1<<7) != 0 {
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// // fmt.Printf(">>>>> ---- double indirect reference: %v, %v\n", rvk, rv.Type())
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// return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: *(*unsafe.Pointer)(urv.ptr), typ: urv.typ}))
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// }
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// // fmt.Printf(">>>>> ++++ direct reference: %v, %v\n", rvk, rv.Type())
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// return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: urv.ptr, typ: urv.typ}))
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// }
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// const (
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// unsafeRvFlagKindMask = 1<<5 - 1
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// unsafeRvKindDirectIface = 1 << 5
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// unsafeRvFlagIndir = 1 << 7
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// unsafeRvFlagAddr = 1 << 8
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// unsafeRvFlagMethod = 1 << 9
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// _USE_RV_INTERFACE bool = false
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// _UNSAFE_RV_DEBUG = true
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// )
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// type unsafeRtype struct {
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// _ [2]uintptr
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// _ uint32
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// _ uint8
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// _ uint8
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// _ uint8
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// kind uint8
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// _ [2]uintptr
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// _ int32
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// }
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// func _rv2i(rv reflect.Value) interface{} {
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// // Note: From use,
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// // - it's never an interface
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// // - the only calls here are for ifaceIndir types.
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// // (though that conditional is wrong)
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// // To know for sure, we need the value of t.kind (which is not exposed).
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// //
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// // Need to validate the path: type is indirect ==> only value is indirect ==> default (value is direct)
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// // - Type indirect, Value indirect: ==> numbers, boolean, slice, struct, array, string
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// // - Type Direct, Value indirect: ==> map???
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// // - Type Direct, Value direct: ==> pointers, unsafe.Pointer, func, chan, map
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// //
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// // TRANSLATES TO:
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// // if typeIndirect { } else if valueIndirect { } else { }
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// //
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// // Since we don't deal with funcs, then "flagNethod" is unset, and can be ignored.
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// if _USE_RV_INTERFACE {
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// return rv.Interface()
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// }
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// urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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// // if urv.flag&unsafeRvFlagMethod != 0 || urv.flag&unsafeRvFlagKindMask == uintptr(reflect.Interface) {
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// // println("***** IS flag method or interface: delegating to rv.Interface()")
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// // return rv.Interface()
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// // }
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// // if urv.flag&unsafeRvFlagKindMask == uintptr(reflect.Interface) {
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// // println("***** IS Interface: delegate to rv.Interface")
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// // return rv.Interface()
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// // }
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// // if urv.flag&unsafeRvFlagKindMask&unsafeRvKindDirectIface == 0 {
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// // if urv.flag&unsafeRvFlagAddr == 0 {
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// // println("***** IS ifaceIndir typ")
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// // // ui := unsafeIntf{word: urv.ptr, typ: urv.typ}
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// // // return *(*interface{})(unsafe.Pointer(&ui))
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// // // return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: urv.ptr, typ: urv.typ}))
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// // }
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// // } else if urv.flag&unsafeRvFlagIndir != 0 {
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// // println("***** IS flagindir")
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// // // return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: *(*unsafe.Pointer)(urv.ptr), typ: urv.typ}))
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// // } else {
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// // println("***** NOT flagindir")
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// // return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: urv.ptr, typ: urv.typ}))
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// // }
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// // println("***** default: delegate to rv.Interface")
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// urt := (*unsafeRtype)(unsafe.Pointer(urv.typ))
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// if _UNSAFE_RV_DEBUG {
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// fmt.Printf(">>>> start: %v: ", rv.Type())
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// fmt.Printf("%v - %v\n", *urv, *urt)
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// }
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// if urt.kind&unsafeRvKindDirectIface == 0 {
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// if _UNSAFE_RV_DEBUG {
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// fmt.Printf("**** +ifaceIndir type: %v\n", rv.Type())
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// }
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// // println("***** IS ifaceIndir typ")
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// // if true || urv.flag&unsafeRvFlagAddr == 0 {
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// // // println(" ***** IS NOT addr")
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// return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: urv.ptr, typ: urv.typ}))
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// // }
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// } else if urv.flag&unsafeRvFlagIndir != 0 {
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// if _UNSAFE_RV_DEBUG {
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// fmt.Printf("**** +flagIndir type: %v\n", rv.Type())
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// }
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// // println("***** IS flagindir")
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// return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: *(*unsafe.Pointer)(urv.ptr), typ: urv.typ}))
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// } else {
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// if _UNSAFE_RV_DEBUG {
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// fmt.Printf("**** -flagIndir type: %v\n", rv.Type())
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// }
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// // println("***** NOT flagindir")
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// return *(*interface{})(unsafe.Pointer(&unsafeIntf{word: urv.ptr, typ: urv.typ}))
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// }
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// // println("***** default: delegating to rv.Interface()")
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// // return rv.Interface()
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// }
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// var staticM0 = make(map[string]uint64)
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// var staticI0 = (int32)(-5)
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// func staticRv2iTest() {
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// i0 := (int32)(-5)
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// m0 := make(map[string]uint16)
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// m0["1"] = 1
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// for _, i := range []interface{}{
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// (int)(7),
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// (uint)(8),
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// (int16)(-9),
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// (uint16)(19),
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// (uintptr)(77),
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// (bool)(true),
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// float32(-32.7),
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// float64(64.9),
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// complex(float32(19), 5),
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// complex(float64(-32), 7),
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// [4]uint64{1, 2, 3, 4},
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// (chan<- int)(nil), // chan,
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// rv2i, // func
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// io.Writer(ioutil.Discard),
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// make(map[string]uint),
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// (map[string]uint)(nil),
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// staticM0,
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// m0,
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// &m0,
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// i0,
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// &i0,
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// &staticI0,
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// &staticM0,
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// []uint32{6, 7, 8},
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// "abc",
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// Raw{},
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// RawExt{},
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// &Raw{},
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// &RawExt{},
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// unsafe.Pointer(&i0),
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// } {
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// i2 := rv2i(reflect.ValueOf(i))
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// eq := reflect.DeepEqual(i, i2)
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// fmt.Printf(">>>> %v == %v? %v\n", i, i2, eq)
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// }
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// // os.Exit(0)
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// }
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// func init() {
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// staticRv2iTest()
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// }
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// func rv2i(rv reflect.Value) interface{} {
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// if _USE_RV_INTERFACE || rv.Kind() == reflect.Interface || rv.CanAddr() {
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// return rv.Interface()
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// }
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// // var i interface{}
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// // ui := (*unsafeIntf)(unsafe.Pointer(&i))
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// var ui unsafeIntf
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// urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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// // fmt.Printf("urv: flag: %b, typ: %b, ptr: %b\n", urv.flag, uintptr(urv.typ), uintptr(urv.ptr))
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// if (urv.flag&unsafeRvFlagKindMask)&unsafeRvKindDirectIface == 0 {
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// if urv.flag&unsafeRvFlagAddr != 0 {
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// println("***** indirect and addressable! Needs typed move - delegate to rv.Interface()")
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// return rv.Interface()
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// }
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// println("****** indirect type/kind")
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// ui.word = urv.ptr
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// } else if urv.flag&unsafeRvFlagIndir != 0 {
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// println("****** unsafe rv flag indir")
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// ui.word = *(*unsafe.Pointer)(urv.ptr)
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// } else {
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// println("****** default: assign prt to word directly")
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// ui.word = urv.ptr
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// }
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// // ui.word = urv.ptr
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// ui.typ = urv.typ
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// // fmt.Printf("(pointers) ui.typ: %p, word: %p\n", ui.typ, ui.word)
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// // fmt.Printf("(binary) ui.typ: %b, word: %b\n", uintptr(ui.typ), uintptr(ui.word))
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// return *(*interface{})(unsafe.Pointer(&ui))
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// // return i
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// }
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