mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-05-28 21:28:14 +00:00
707 lines
15 KiB
Go
707 lines
15 KiB
Go
// Copyright (c) 2012-2020 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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//go:build !go1.9 || safe || codec.safe || appengine
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// +build !go1.9 safe codec.safe appengine
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package codec
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import (
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// "hash/adler32"
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"math"
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"reflect"
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"sync/atomic"
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"time"
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)
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// This file has safe variants of some helper functions.
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// MARKER: See helper_unsafe.go for the usage documentation.
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const safeMode = true
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const transientSizeMax = 0
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const transientValueHasStringSlice = true
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func byteAt(b []byte, index uint) byte {
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return b[index]
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}
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func setByteAt(b []byte, index uint, val byte) {
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b[index] = val
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}
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func byteSliceOf(b []byte, start, end uint) []byte {
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return b[start:end]
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}
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// func byteSliceWithLen(b []byte, length uint) []byte {
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// return b[:length]
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// }
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func stringView(v []byte) string {
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return string(v)
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}
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func bytesView(v string) []byte {
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return []byte(v)
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}
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func byteSliceSameData(v1 []byte, v2 []byte) bool {
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return cap(v1) != 0 && cap(v2) != 0 && &(v1[:1][0]) == &(v2[:1][0])
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}
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func okBytes2(b []byte) (v [2]byte) {
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copy(v[:], b)
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return
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}
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func okBytes3(b []byte) (v [3]byte) {
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copy(v[:], b)
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return
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}
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func okBytes4(b []byte) (v [4]byte) {
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copy(v[:], b)
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return
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}
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func okBytes8(b []byte) (v [8]byte) {
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copy(v[:], b)
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return
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}
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func isNil(v interface{}) (rv reflect.Value, isnil bool) {
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rv = reflect.ValueOf(v)
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if isnilBitset.isset(byte(rv.Kind())) {
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isnil = rv.IsNil()
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}
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return
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}
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func eq4i(i0, i1 interface{}) bool {
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return i0 == i1
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}
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func rv4iptr(i interface{}) reflect.Value { return reflect.ValueOf(i) }
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func rv4istr(i interface{}) reflect.Value { return reflect.ValueOf(i) }
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// func rv4i(i interface{}) reflect.Value { return reflect.ValueOf(i) }
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// func rv4iK(i interface{}, kind byte, isref bool) reflect.Value { return reflect.ValueOf(i) }
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func rv2i(rv reflect.Value) interface{} {
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return rv.Interface()
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}
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func rvAddr(rv reflect.Value, ptrType reflect.Type) reflect.Value {
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return rv.Addr()
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}
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func rvIsNil(rv reflect.Value) bool {
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return rv.IsNil()
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}
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func rvSetSliceLen(rv reflect.Value, length int) {
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rv.SetLen(length)
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}
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func rvZeroAddrK(t reflect.Type, k reflect.Kind) reflect.Value {
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return reflect.New(t).Elem()
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}
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func rvZeroK(t reflect.Type, k reflect.Kind) reflect.Value {
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return reflect.Zero(t)
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}
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func rvConvert(v reflect.Value, t reflect.Type) (rv reflect.Value) {
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// Note that reflect.Value.Convert(...) will make a copy if it is addressable.
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// Since we decode into the passed value, we must try to convert the addressable value..
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if v.CanAddr() {
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return v.Addr().Convert(reflect.PtrTo(t)).Elem()
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}
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return v.Convert(t)
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}
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func rt2id(rt reflect.Type) uintptr {
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return reflect.ValueOf(rt).Pointer()
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}
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func i2rtid(i interface{}) uintptr {
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return reflect.ValueOf(reflect.TypeOf(i)).Pointer()
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}
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// --------------------------
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func isEmptyValue(v reflect.Value, tinfos *TypeInfos, recursive bool) bool {
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switch v.Kind() {
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case reflect.Invalid:
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return true
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case reflect.String:
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return v.Len() == 0
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case reflect.Array:
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// zero := reflect.Zero(v.Type().Elem())
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// can I just check if the whole value is equal to zeros? seems not.
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// can I just check if the whole value is equal to its zero value? no.
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// Well, then we check if each value is empty without recursive.
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for i, vlen := 0, v.Len(); i < vlen; i++ {
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if !isEmptyValue(v.Index(i), tinfos, false) {
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return false
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}
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}
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return true
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case reflect.Map, reflect.Slice, reflect.Chan:
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return v.IsNil() || v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return v.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return v.Uint() == 0
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case reflect.Complex64, reflect.Complex128:
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c := v.Complex()
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return math.Float64bits(real(c)) == 0 && math.Float64bits(imag(c)) == 0
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case reflect.Float32, reflect.Float64:
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return v.Float() == 0
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case reflect.Func, reflect.UnsafePointer:
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return v.IsNil()
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case reflect.Interface, reflect.Ptr:
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isnil := v.IsNil()
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if recursive && !isnil {
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return isEmptyValue(v.Elem(), tinfos, recursive)
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}
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return isnil
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case reflect.Struct:
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return isEmptyStruct(v, tinfos, recursive)
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}
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return false
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}
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// isEmptyStruct is only called from isEmptyValue, and checks if a struct is empty:
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// - does it implement IsZero() bool
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// - is it comparable, and can i compare directly using ==
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// - if checkStruct, then walk through the encodable fields
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// and check if they are empty or not.
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func isEmptyStruct(v reflect.Value, tinfos *TypeInfos, recursive bool) bool {
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// v is a struct kind - no need to check again.
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// We only check isZero on a struct kind, to reduce the amount of times
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// that we lookup the rtid and typeInfo for each type as we walk the tree.
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vt := v.Type()
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rtid := rt2id(vt)
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if tinfos == nil {
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tinfos = defTypeInfos
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}
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ti := tinfos.get(rtid, vt)
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if ti.rtid == timeTypId {
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return rv2i(v).(time.Time).IsZero()
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}
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if ti.flagIsZeroer {
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return rv2i(v).(isZeroer).IsZero()
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}
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if ti.flagIsZeroerPtr && v.CanAddr() {
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return rv2i(v.Addr()).(isZeroer).IsZero()
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}
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if ti.flagIsCodecEmptyer {
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return rv2i(v).(isCodecEmptyer).IsCodecEmpty()
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}
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if ti.flagIsCodecEmptyerPtr && v.CanAddr() {
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return rv2i(v.Addr()).(isCodecEmptyer).IsCodecEmpty()
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}
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if ti.flagComparable {
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return rv2i(v) == rv2i(rvZeroK(vt, reflect.Struct))
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}
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if !recursive {
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return false
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}
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// We only care about what we can encode/decode,
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// so that is what we use to check omitEmpty.
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for _, si := range ti.sfi.source() {
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sfv := si.path.field(v)
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if sfv.IsValid() && !isEmptyValue(sfv, tinfos, recursive) {
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return false
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}
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}
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return true
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}
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// --------------------------
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type perTypeElem struct {
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t reflect.Type
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rtid uintptr
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zero reflect.Value
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addr [2]reflect.Value
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}
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func (x *perTypeElem) get(index uint8) (v reflect.Value) {
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v = x.addr[index%2]
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if v.IsValid() {
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v.Set(x.zero)
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} else {
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v = reflect.New(x.t).Elem()
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x.addr[index%2] = v
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}
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return
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}
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type perType struct {
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v []perTypeElem
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}
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type decPerType struct {
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perType
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}
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type encPerType struct {
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perType
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}
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func (x *perType) elem(t reflect.Type) *perTypeElem {
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rtid := rt2id(t)
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var h, i uint
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var j = uint(len(x.v))
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LOOP:
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if i < j {
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h = (i + j) >> 1 // avoid overflow when computing h // h = i + (j-i)/2
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if x.v[h].rtid < rtid {
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i = h + 1
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} else {
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j = h
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}
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goto LOOP
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}
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if i < uint(len(x.v)) {
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if x.v[i].rtid != rtid {
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x.v = append(x.v, perTypeElem{})
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copy(x.v[i+1:], x.v[i:])
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x.v[i] = perTypeElem{t: t, rtid: rtid, zero: reflect.Zero(t)}
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}
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} else {
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x.v = append(x.v, perTypeElem{t: t, rtid: rtid, zero: reflect.Zero(t)})
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}
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return &x.v[i]
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}
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func (x *perType) TransientAddrK(t reflect.Type, k reflect.Kind) (rv reflect.Value) {
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return x.elem(t).get(0)
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}
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func (x *perType) TransientAddr2K(t reflect.Type, k reflect.Kind) (rv reflect.Value) {
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return x.elem(t).get(1)
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}
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func (x *perType) AddressableRO(v reflect.Value) (rv reflect.Value) {
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rv = x.elem(v.Type()).get(0)
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rvSetDirect(rv, v)
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return
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}
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// --------------------------
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type structFieldInfos struct {
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c []*structFieldInfo
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s []*structFieldInfo
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}
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func (x *structFieldInfos) load(source, sorted []*structFieldInfo) {
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x.c = source
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x.s = sorted
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}
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func (x *structFieldInfos) sorted() (v []*structFieldInfo) { return x.s }
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func (x *structFieldInfos) source() (v []*structFieldInfo) { return x.c }
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type atomicClsErr struct {
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v atomic.Value
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}
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func (x *atomicClsErr) load() (e clsErr) {
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if i := x.v.Load(); i != nil {
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e = i.(clsErr)
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}
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return
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}
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func (x *atomicClsErr) store(p clsErr) {
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x.v.Store(p)
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}
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// --------------------------
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type atomicTypeInfoSlice struct {
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v atomic.Value
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}
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func (x *atomicTypeInfoSlice) load() (e []rtid2ti) {
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if i := x.v.Load(); i != nil {
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e = i.([]rtid2ti)
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}
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return
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}
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func (x *atomicTypeInfoSlice) store(p []rtid2ti) {
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x.v.Store(p)
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}
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// --------------------------
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type atomicRtidFnSlice struct {
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v atomic.Value
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}
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func (x *atomicRtidFnSlice) load() (e []codecRtidFn) {
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if i := x.v.Load(); i != nil {
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e = i.([]codecRtidFn)
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}
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return
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}
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func (x *atomicRtidFnSlice) store(p []codecRtidFn) {
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x.v.Store(p)
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}
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// --------------------------
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func (n *fauxUnion) ru() reflect.Value {
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return reflect.ValueOf(&n.u).Elem()
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}
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func (n *fauxUnion) ri() reflect.Value {
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return reflect.ValueOf(&n.i).Elem()
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}
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func (n *fauxUnion) rf() reflect.Value {
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return reflect.ValueOf(&n.f).Elem()
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}
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func (n *fauxUnion) rl() reflect.Value {
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return reflect.ValueOf(&n.l).Elem()
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}
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func (n *fauxUnion) rs() reflect.Value {
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return reflect.ValueOf(&n.s).Elem()
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}
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func (n *fauxUnion) rt() reflect.Value {
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return reflect.ValueOf(&n.t).Elem()
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}
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func (n *fauxUnion) rb() reflect.Value {
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return reflect.ValueOf(&n.b).Elem()
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}
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// --------------------------
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func rvSetBytes(rv reflect.Value, v []byte) {
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rv.SetBytes(v)
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}
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func rvSetString(rv reflect.Value, v string) {
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rv.SetString(v)
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}
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func rvSetBool(rv reflect.Value, v bool) {
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rv.SetBool(v)
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}
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func rvSetTime(rv reflect.Value, v time.Time) {
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rv.Set(reflect.ValueOf(v))
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}
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func rvSetFloat32(rv reflect.Value, v float32) {
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rv.SetFloat(float64(v))
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}
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func rvSetFloat64(rv reflect.Value, v float64) {
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rv.SetFloat(v)
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}
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func rvSetComplex64(rv reflect.Value, v complex64) {
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rv.SetComplex(complex128(v))
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}
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func rvSetComplex128(rv reflect.Value, v complex128) {
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rv.SetComplex(v)
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}
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func rvSetInt(rv reflect.Value, v int) {
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rv.SetInt(int64(v))
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}
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func rvSetInt8(rv reflect.Value, v int8) {
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rv.SetInt(int64(v))
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}
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func rvSetInt16(rv reflect.Value, v int16) {
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rv.SetInt(int64(v))
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}
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func rvSetInt32(rv reflect.Value, v int32) {
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rv.SetInt(int64(v))
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}
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func rvSetInt64(rv reflect.Value, v int64) {
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rv.SetInt(v)
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}
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func rvSetUint(rv reflect.Value, v uint) {
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rv.SetUint(uint64(v))
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}
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func rvSetUintptr(rv reflect.Value, v uintptr) {
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rv.SetUint(uint64(v))
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}
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func rvSetUint8(rv reflect.Value, v uint8) {
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rv.SetUint(uint64(v))
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}
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func rvSetUint16(rv reflect.Value, v uint16) {
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rv.SetUint(uint64(v))
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}
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func rvSetUint32(rv reflect.Value, v uint32) {
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rv.SetUint(uint64(v))
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}
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func rvSetUint64(rv reflect.Value, v uint64) {
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rv.SetUint(v)
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}
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// ----------------
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func rvSetDirect(rv reflect.Value, v reflect.Value) {
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rv.Set(v)
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}
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func rvSetDirectZero(rv reflect.Value) {
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rv.Set(reflect.Zero(rv.Type()))
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}
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|
// func rvSet(rv reflect.Value, v reflect.Value) {
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// rv.Set(v)
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// }
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|
|
|
func rvSetIntf(rv reflect.Value, v reflect.Value) {
|
|
rv.Set(v)
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|
}
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|
func rvSetZero(rv reflect.Value) {
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|
rv.Set(reflect.Zero(rv.Type()))
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|
}
|
|
|
|
func rvSlice(rv reflect.Value, length int) reflect.Value {
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|
return rv.Slice(0, length)
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|
}
|
|
|
|
func rvMakeSlice(rv reflect.Value, ti *typeInfo, xlen, xcap int) (v reflect.Value, set bool) {
|
|
v = reflect.MakeSlice(ti.rt, xlen, xcap)
|
|
if rv.Len() > 0 {
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|
reflect.Copy(v, rv)
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|
}
|
|
return
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|
}
|
|
|
|
func rvGrowSlice(rv reflect.Value, ti *typeInfo, cap, incr int) (v reflect.Value, newcap int, set bool) {
|
|
newcap = int(growCap(uint(cap), uint(ti.elemsize), uint(incr)))
|
|
v = reflect.MakeSlice(ti.rt, newcap, newcap)
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|
if rv.Len() > 0 {
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|
reflect.Copy(v, rv)
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|
}
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return
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|
}
|
|
|
|
// ----------------
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|
func rvSliceIndex(rv reflect.Value, i int, ti *typeInfo) reflect.Value {
|
|
return rv.Index(i)
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|
}
|
|
|
|
func rvArrayIndex(rv reflect.Value, i int, ti *typeInfo) reflect.Value {
|
|
return rv.Index(i)
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|
}
|
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|
|
func rvSliceZeroCap(t reflect.Type) (v reflect.Value) {
|
|
return reflect.MakeSlice(t, 0, 0)
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|
}
|
|
|
|
func rvLenSlice(rv reflect.Value) int {
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|
return rv.Len()
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|
}
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|
|
|
func rvCapSlice(rv reflect.Value) int {
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|
return rv.Cap()
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|
}
|
|
|
|
func rvGetArrayBytes(rv reflect.Value, scratch []byte) (bs []byte) {
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|
l := rv.Len()
|
|
if scratch == nil || rv.CanAddr() {
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|
return rv.Slice(0, l).Bytes()
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|
}
|
|
|
|
if l <= cap(scratch) {
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|
bs = scratch[:l]
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|
} else {
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|
bs = make([]byte, l)
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}
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|
reflect.Copy(reflect.ValueOf(bs), rv)
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return
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}
|
|
|
|
func rvGetArray4Slice(rv reflect.Value) (v reflect.Value) {
|
|
v = rvZeroAddrK(reflectArrayOf(rvLenSlice(rv), rv.Type().Elem()), reflect.Array)
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|
reflect.Copy(v, rv)
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return
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}
|
|
|
|
func rvGetSlice4Array(rv reflect.Value, v interface{}) {
|
|
// v is a pointer to a slice to be populated
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|
|
|
// rv.Slice fails if address is not addressable, which can occur during encoding.
|
|
// Consequently, check if non-addressable, and if so, make new slice and copy into it first.
|
|
// MARKER: this *may* cause allocation if non-addressable, unfortunately.
|
|
|
|
rve := reflect.ValueOf(v).Elem()
|
|
l := rv.Len()
|
|
if rv.CanAddr() {
|
|
rve.Set(rv.Slice(0, l))
|
|
} else {
|
|
rvs := reflect.MakeSlice(rve.Type(), l, l)
|
|
reflect.Copy(rvs, rv)
|
|
rve.Set(rvs)
|
|
}
|
|
// reflect.ValueOf(v).Elem().Set(rv.Slice(0, rv.Len()))
|
|
}
|
|
|
|
func rvCopySlice(dest, src reflect.Value, _ reflect.Type) {
|
|
reflect.Copy(dest, src)
|
|
}
|
|
|
|
// ------------
|
|
|
|
func rvGetBool(rv reflect.Value) bool {
|
|
return rv.Bool()
|
|
}
|
|
|
|
func rvGetBytes(rv reflect.Value) []byte {
|
|
return rv.Bytes()
|
|
}
|
|
|
|
func rvGetTime(rv reflect.Value) time.Time {
|
|
return rv2i(rv).(time.Time)
|
|
}
|
|
|
|
func rvGetString(rv reflect.Value) string {
|
|
return rv.String()
|
|
}
|
|
|
|
func rvGetFloat64(rv reflect.Value) float64 {
|
|
return rv.Float()
|
|
}
|
|
|
|
func rvGetFloat32(rv reflect.Value) float32 {
|
|
return float32(rv.Float())
|
|
}
|
|
|
|
func rvGetComplex64(rv reflect.Value) complex64 {
|
|
return complex64(rv.Complex())
|
|
}
|
|
|
|
func rvGetComplex128(rv reflect.Value) complex128 {
|
|
return rv.Complex()
|
|
}
|
|
|
|
func rvGetInt(rv reflect.Value) int {
|
|
return int(rv.Int())
|
|
}
|
|
|
|
func rvGetInt8(rv reflect.Value) int8 {
|
|
return int8(rv.Int())
|
|
}
|
|
|
|
func rvGetInt16(rv reflect.Value) int16 {
|
|
return int16(rv.Int())
|
|
}
|
|
|
|
func rvGetInt32(rv reflect.Value) int32 {
|
|
return int32(rv.Int())
|
|
}
|
|
|
|
func rvGetInt64(rv reflect.Value) int64 {
|
|
return rv.Int()
|
|
}
|
|
|
|
func rvGetUint(rv reflect.Value) uint {
|
|
return uint(rv.Uint())
|
|
}
|
|
|
|
func rvGetUint8(rv reflect.Value) uint8 {
|
|
return uint8(rv.Uint())
|
|
}
|
|
|
|
func rvGetUint16(rv reflect.Value) uint16 {
|
|
return uint16(rv.Uint())
|
|
}
|
|
|
|
func rvGetUint32(rv reflect.Value) uint32 {
|
|
return uint32(rv.Uint())
|
|
}
|
|
|
|
func rvGetUint64(rv reflect.Value) uint64 {
|
|
return rv.Uint()
|
|
}
|
|
|
|
func rvGetUintptr(rv reflect.Value) uintptr {
|
|
return uintptr(rv.Uint())
|
|
}
|
|
|
|
func rvLenMap(rv reflect.Value) int {
|
|
return rv.Len()
|
|
}
|
|
|
|
// func copybytes(to, from []byte) int {
|
|
// return copy(to, from)
|
|
// }
|
|
|
|
// func copybytestr(to []byte, from string) int {
|
|
// return copy(to, from)
|
|
// }
|
|
|
|
// func rvLenArray(rv reflect.Value) int { return rv.Len() }
|
|
|
|
// ------------ map range and map indexing ----------
|
|
|
|
func mapStoresElemIndirect(elemsize uintptr) bool { return false }
|
|
|
|
func mapSet(m, k, v reflect.Value, keyFastKind mapKeyFastKind, _, _ bool) {
|
|
m.SetMapIndex(k, v)
|
|
}
|
|
|
|
func mapGet(m, k, v reflect.Value, keyFastKind mapKeyFastKind, _, _ bool) (vv reflect.Value) {
|
|
return m.MapIndex(k)
|
|
}
|
|
|
|
// func mapDelete(m, k reflect.Value) {
|
|
// m.SetMapIndex(k, reflect.Value{})
|
|
// }
|
|
|
|
func mapAddrLoopvarRV(t reflect.Type, k reflect.Kind) (r reflect.Value) {
|
|
return // reflect.New(t).Elem()
|
|
}
|
|
|
|
// ---------- ENCODER optimized ---------------
|
|
|
|
func (e *Encoder) jsondriver() *jsonEncDriver {
|
|
return e.e.(*jsonEncDriver)
|
|
}
|
|
|
|
// ---------- DECODER optimized ---------------
|
|
|
|
func (d *Decoder) jsondriver() *jsonDecDriver {
|
|
return d.d.(*jsonDecDriver)
|
|
}
|
|
|
|
func (d *Decoder) stringZC(v []byte) (s string) {
|
|
return d.string(v)
|
|
}
|
|
|
|
func (d *Decoder) mapKeyString(callFnRvk *bool, kstrbs, kstr2bs *[]byte) string {
|
|
return d.string(*kstr2bs)
|
|
}
|
|
|
|
// ---------- structFieldInfo optimized ---------------
|
|
|
|
func (n *structFieldInfoPathNode) rvField(v reflect.Value) reflect.Value {
|
|
return v.Field(int(n.index))
|
|
}
|
|
|
|
// ---------- others ---------------
|