khenaidoo | ffe076b | 2019-01-15 16:08:08 -0500 | [diff] [blame^] | 1 | // +build !go1.7 safe appengine |
| 2 | |
| 3 | // Copyright (c) 2012-2018 Ugorji Nwoke. All rights reserved. |
| 4 | // Use of this source code is governed by a MIT license found in the LICENSE file. |
| 5 | |
| 6 | package codec |
| 7 | |
| 8 | import ( |
| 9 | "reflect" |
| 10 | "sync/atomic" |
| 11 | "time" |
| 12 | ) |
| 13 | |
| 14 | const safeMode = true |
| 15 | |
| 16 | // stringView returns a view of the []byte as a string. |
| 17 | // In unsafe mode, it doesn't incur allocation and copying caused by conversion. |
| 18 | // In regular safe mode, it is an allocation and copy. |
| 19 | // |
| 20 | // Usage: Always maintain a reference to v while result of this call is in use, |
| 21 | // and call keepAlive4BytesView(v) at point where done with view. |
| 22 | func stringView(v []byte) string { |
| 23 | return string(v) |
| 24 | } |
| 25 | |
| 26 | // bytesView returns a view of the string as a []byte. |
| 27 | // In unsafe mode, it doesn't incur allocation and copying caused by conversion. |
| 28 | // In regular safe mode, it is an allocation and copy. |
| 29 | // |
| 30 | // Usage: Always maintain a reference to v while result of this call is in use, |
| 31 | // and call keepAlive4BytesView(v) at point where done with view. |
| 32 | func bytesView(v string) []byte { |
| 33 | return []byte(v) |
| 34 | } |
| 35 | |
| 36 | func definitelyNil(v interface{}) bool { |
| 37 | // this is a best-effort option. |
| 38 | // We just return false, so we don't unnecessarily incur the cost of reflection this early. |
| 39 | return false |
| 40 | } |
| 41 | |
| 42 | func rv2i(rv reflect.Value) interface{} { |
| 43 | return rv.Interface() |
| 44 | } |
| 45 | |
| 46 | func rt2id(rt reflect.Type) uintptr { |
| 47 | return reflect.ValueOf(rt).Pointer() |
| 48 | } |
| 49 | |
| 50 | func rv2rtid(rv reflect.Value) uintptr { |
| 51 | return reflect.ValueOf(rv.Type()).Pointer() |
| 52 | } |
| 53 | |
| 54 | func i2rtid(i interface{}) uintptr { |
| 55 | return reflect.ValueOf(reflect.TypeOf(i)).Pointer() |
| 56 | } |
| 57 | |
| 58 | // -------------------------- |
| 59 | |
| 60 | func isEmptyValue(v reflect.Value, tinfos *TypeInfos, deref, checkStruct bool) bool { |
| 61 | switch v.Kind() { |
| 62 | case reflect.Invalid: |
| 63 | return true |
| 64 | case reflect.Array, reflect.Map, reflect.Slice, reflect.String: |
| 65 | return v.Len() == 0 |
| 66 | case reflect.Bool: |
| 67 | return !v.Bool() |
| 68 | case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
| 69 | return v.Int() == 0 |
| 70 | case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: |
| 71 | return v.Uint() == 0 |
| 72 | case reflect.Float32, reflect.Float64: |
| 73 | return v.Float() == 0 |
| 74 | case reflect.Interface, reflect.Ptr: |
| 75 | if deref { |
| 76 | if v.IsNil() { |
| 77 | return true |
| 78 | } |
| 79 | return isEmptyValue(v.Elem(), tinfos, deref, checkStruct) |
| 80 | } |
| 81 | return v.IsNil() |
| 82 | case reflect.Struct: |
| 83 | return isEmptyStruct(v, tinfos, deref, checkStruct) |
| 84 | } |
| 85 | return false |
| 86 | } |
| 87 | |
| 88 | // -------------------------- |
| 89 | // type ptrToRvMap struct{} |
| 90 | |
| 91 | // func (*ptrToRvMap) init() {} |
| 92 | // func (*ptrToRvMap) get(i interface{}) reflect.Value { |
| 93 | // return reflect.ValueOf(i).Elem() |
| 94 | // } |
| 95 | |
| 96 | // -------------------------- |
| 97 | type atomicTypeInfoSlice struct { // expected to be 2 words |
| 98 | v atomic.Value |
| 99 | } |
| 100 | |
| 101 | func (x *atomicTypeInfoSlice) load() []rtid2ti { |
| 102 | i := x.v.Load() |
| 103 | if i == nil { |
| 104 | return nil |
| 105 | } |
| 106 | return i.([]rtid2ti) |
| 107 | } |
| 108 | |
| 109 | func (x *atomicTypeInfoSlice) store(p []rtid2ti) { |
| 110 | x.v.Store(p) |
| 111 | } |
| 112 | |
| 113 | // -------------------------- |
| 114 | func (d *Decoder) raw(f *codecFnInfo, rv reflect.Value) { |
| 115 | rv.SetBytes(d.rawBytes()) |
| 116 | } |
| 117 | |
| 118 | func (d *Decoder) kString(f *codecFnInfo, rv reflect.Value) { |
| 119 | rv.SetString(d.d.DecodeString()) |
| 120 | } |
| 121 | |
| 122 | func (d *Decoder) kBool(f *codecFnInfo, rv reflect.Value) { |
| 123 | rv.SetBool(d.d.DecodeBool()) |
| 124 | } |
| 125 | |
| 126 | func (d *Decoder) kTime(f *codecFnInfo, rv reflect.Value) { |
| 127 | rv.Set(reflect.ValueOf(d.d.DecodeTime())) |
| 128 | } |
| 129 | |
| 130 | func (d *Decoder) kFloat32(f *codecFnInfo, rv reflect.Value) { |
| 131 | fv := d.d.DecodeFloat64() |
| 132 | if chkOvf.Float32(fv) { |
| 133 | d.errorf("float32 overflow: %v", fv) |
| 134 | } |
| 135 | rv.SetFloat(fv) |
| 136 | } |
| 137 | |
| 138 | func (d *Decoder) kFloat64(f *codecFnInfo, rv reflect.Value) { |
| 139 | rv.SetFloat(d.d.DecodeFloat64()) |
| 140 | } |
| 141 | |
| 142 | func (d *Decoder) kInt(f *codecFnInfo, rv reflect.Value) { |
| 143 | rv.SetInt(chkOvf.IntV(d.d.DecodeInt64(), intBitsize)) |
| 144 | } |
| 145 | |
| 146 | func (d *Decoder) kInt8(f *codecFnInfo, rv reflect.Value) { |
| 147 | rv.SetInt(chkOvf.IntV(d.d.DecodeInt64(), 8)) |
| 148 | } |
| 149 | |
| 150 | func (d *Decoder) kInt16(f *codecFnInfo, rv reflect.Value) { |
| 151 | rv.SetInt(chkOvf.IntV(d.d.DecodeInt64(), 16)) |
| 152 | } |
| 153 | |
| 154 | func (d *Decoder) kInt32(f *codecFnInfo, rv reflect.Value) { |
| 155 | rv.SetInt(chkOvf.IntV(d.d.DecodeInt64(), 32)) |
| 156 | } |
| 157 | |
| 158 | func (d *Decoder) kInt64(f *codecFnInfo, rv reflect.Value) { |
| 159 | rv.SetInt(d.d.DecodeInt64()) |
| 160 | } |
| 161 | |
| 162 | func (d *Decoder) kUint(f *codecFnInfo, rv reflect.Value) { |
| 163 | rv.SetUint(chkOvf.UintV(d.d.DecodeUint64(), uintBitsize)) |
| 164 | } |
| 165 | |
| 166 | func (d *Decoder) kUintptr(f *codecFnInfo, rv reflect.Value) { |
| 167 | rv.SetUint(chkOvf.UintV(d.d.DecodeUint64(), uintBitsize)) |
| 168 | } |
| 169 | |
| 170 | func (d *Decoder) kUint8(f *codecFnInfo, rv reflect.Value) { |
| 171 | rv.SetUint(chkOvf.UintV(d.d.DecodeUint64(), 8)) |
| 172 | } |
| 173 | |
| 174 | func (d *Decoder) kUint16(f *codecFnInfo, rv reflect.Value) { |
| 175 | rv.SetUint(chkOvf.UintV(d.d.DecodeUint64(), 16)) |
| 176 | } |
| 177 | |
| 178 | func (d *Decoder) kUint32(f *codecFnInfo, rv reflect.Value) { |
| 179 | rv.SetUint(chkOvf.UintV(d.d.DecodeUint64(), 32)) |
| 180 | } |
| 181 | |
| 182 | func (d *Decoder) kUint64(f *codecFnInfo, rv reflect.Value) { |
| 183 | rv.SetUint(d.d.DecodeUint64()) |
| 184 | } |
| 185 | |
| 186 | // ---------------- |
| 187 | |
| 188 | func (e *Encoder) kBool(f *codecFnInfo, rv reflect.Value) { |
| 189 | e.e.EncodeBool(rv.Bool()) |
| 190 | } |
| 191 | |
| 192 | func (e *Encoder) kTime(f *codecFnInfo, rv reflect.Value) { |
| 193 | e.e.EncodeTime(rv2i(rv).(time.Time)) |
| 194 | } |
| 195 | |
| 196 | func (e *Encoder) kString(f *codecFnInfo, rv reflect.Value) { |
| 197 | e.e.EncodeString(cUTF8, rv.String()) |
| 198 | } |
| 199 | |
| 200 | func (e *Encoder) kFloat64(f *codecFnInfo, rv reflect.Value) { |
| 201 | e.e.EncodeFloat64(rv.Float()) |
| 202 | } |
| 203 | |
| 204 | func (e *Encoder) kFloat32(f *codecFnInfo, rv reflect.Value) { |
| 205 | e.e.EncodeFloat32(float32(rv.Float())) |
| 206 | } |
| 207 | |
| 208 | func (e *Encoder) kInt(f *codecFnInfo, rv reflect.Value) { |
| 209 | e.e.EncodeInt(rv.Int()) |
| 210 | } |
| 211 | |
| 212 | func (e *Encoder) kInt8(f *codecFnInfo, rv reflect.Value) { |
| 213 | e.e.EncodeInt(rv.Int()) |
| 214 | } |
| 215 | |
| 216 | func (e *Encoder) kInt16(f *codecFnInfo, rv reflect.Value) { |
| 217 | e.e.EncodeInt(rv.Int()) |
| 218 | } |
| 219 | |
| 220 | func (e *Encoder) kInt32(f *codecFnInfo, rv reflect.Value) { |
| 221 | e.e.EncodeInt(rv.Int()) |
| 222 | } |
| 223 | |
| 224 | func (e *Encoder) kInt64(f *codecFnInfo, rv reflect.Value) { |
| 225 | e.e.EncodeInt(rv.Int()) |
| 226 | } |
| 227 | |
| 228 | func (e *Encoder) kUint(f *codecFnInfo, rv reflect.Value) { |
| 229 | e.e.EncodeUint(rv.Uint()) |
| 230 | } |
| 231 | |
| 232 | func (e *Encoder) kUint8(f *codecFnInfo, rv reflect.Value) { |
| 233 | e.e.EncodeUint(rv.Uint()) |
| 234 | } |
| 235 | |
| 236 | func (e *Encoder) kUint16(f *codecFnInfo, rv reflect.Value) { |
| 237 | e.e.EncodeUint(rv.Uint()) |
| 238 | } |
| 239 | |
| 240 | func (e *Encoder) kUint32(f *codecFnInfo, rv reflect.Value) { |
| 241 | e.e.EncodeUint(rv.Uint()) |
| 242 | } |
| 243 | |
| 244 | func (e *Encoder) kUint64(f *codecFnInfo, rv reflect.Value) { |
| 245 | e.e.EncodeUint(rv.Uint()) |
| 246 | } |
| 247 | |
| 248 | func (e *Encoder) kUintptr(f *codecFnInfo, rv reflect.Value) { |
| 249 | e.e.EncodeUint(rv.Uint()) |
| 250 | } |
| 251 | |
| 252 | // // keepAlive4BytesView maintains a reference to the input parameter for bytesView. |
| 253 | // // |
| 254 | // // Usage: call this at point where done with the bytes view. |
| 255 | // func keepAlive4BytesView(v string) {} |
| 256 | |
| 257 | // // keepAlive4BytesView maintains a reference to the input parameter for stringView. |
| 258 | // // |
| 259 | // // Usage: call this at point where done with the string view. |
| 260 | // func keepAlive4StringView(v []byte) {} |
| 261 | |
| 262 | // func definitelyNil(v interface{}) bool { |
| 263 | // rv := reflect.ValueOf(v) |
| 264 | // switch rv.Kind() { |
| 265 | // case reflect.Invalid: |
| 266 | // return true |
| 267 | // case reflect.Ptr, reflect.Interface, reflect.Chan, reflect.Slice, reflect.Map, reflect.Func: |
| 268 | // return rv.IsNil() |
| 269 | // default: |
| 270 | // return false |
| 271 | // } |
| 272 | // } |