David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Go support for Protocol Buffers - Google's data interchange format |
| 2 | // |
| 3 | // Copyright 2012 The Go Authors. All rights reserved. |
| 4 | // https://github.com/golang/protobuf |
| 5 | // |
| 6 | // Redistribution and use in source and binary forms, with or without |
| 7 | // modification, are permitted provided that the following conditions are |
| 8 | // met: |
| 9 | // |
| 10 | // * Redistributions of source code must retain the above copyright |
| 11 | // notice, this list of conditions and the following disclaimer. |
| 12 | // * Redistributions in binary form must reproduce the above |
| 13 | // copyright notice, this list of conditions and the following disclaimer |
| 14 | // in the documentation and/or other materials provided with the |
| 15 | // distribution. |
| 16 | // * Neither the name of Google Inc. nor the names of its |
| 17 | // contributors may be used to endorse or promote products derived from |
| 18 | // this software without specific prior written permission. |
| 19 | // |
| 20 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | |
| 32 | // +build appengine js |
| 33 | |
| 34 | // This file contains an implementation of proto field accesses using package reflect. |
| 35 | // It is slower than the code in pointer_unsafe.go but it avoids package unsafe and can |
| 36 | // be used on App Engine. |
| 37 | |
| 38 | package proto |
| 39 | |
| 40 | import ( |
| 41 | "math" |
| 42 | "reflect" |
| 43 | ) |
| 44 | |
| 45 | // A structPointer is a pointer to a struct. |
| 46 | type structPointer struct { |
| 47 | v reflect.Value |
| 48 | } |
| 49 | |
| 50 | // toStructPointer returns a structPointer equivalent to the given reflect value. |
| 51 | // The reflect value must itself be a pointer to a struct. |
| 52 | func toStructPointer(v reflect.Value) structPointer { |
| 53 | return structPointer{v} |
| 54 | } |
| 55 | |
| 56 | // IsNil reports whether p is nil. |
| 57 | func structPointer_IsNil(p structPointer) bool { |
| 58 | return p.v.IsNil() |
| 59 | } |
| 60 | |
| 61 | // Interface returns the struct pointer as an interface value. |
| 62 | func structPointer_Interface(p structPointer, _ reflect.Type) interface{} { |
| 63 | return p.v.Interface() |
| 64 | } |
| 65 | |
| 66 | // A field identifies a field in a struct, accessible from a structPointer. |
| 67 | // In this implementation, a field is identified by the sequence of field indices |
| 68 | // passed to reflect's FieldByIndex. |
| 69 | type field []int |
| 70 | |
| 71 | // toField returns a field equivalent to the given reflect field. |
| 72 | func toField(f *reflect.StructField) field { |
| 73 | return f.Index |
| 74 | } |
| 75 | |
| 76 | // invalidField is an invalid field identifier. |
| 77 | var invalidField = field(nil) |
| 78 | |
| 79 | // IsValid reports whether the field identifier is valid. |
| 80 | func (f field) IsValid() bool { return f != nil } |
| 81 | |
| 82 | // field returns the given field in the struct as a reflect value. |
| 83 | func structPointer_field(p structPointer, f field) reflect.Value { |
| 84 | // Special case: an extension map entry with a value of type T |
| 85 | // passes a *T to the struct-handling code with a zero field, |
| 86 | // expecting that it will be treated as equivalent to *struct{ X T }, |
| 87 | // which has the same memory layout. We have to handle that case |
| 88 | // specially, because reflect will panic if we call FieldByIndex on a |
| 89 | // non-struct. |
| 90 | if f == nil { |
| 91 | return p.v.Elem() |
| 92 | } |
| 93 | |
| 94 | return p.v.Elem().FieldByIndex(f) |
| 95 | } |
| 96 | |
| 97 | // ifield returns the given field in the struct as an interface value. |
| 98 | func structPointer_ifield(p structPointer, f field) interface{} { |
| 99 | return structPointer_field(p, f).Addr().Interface() |
| 100 | } |
| 101 | |
| 102 | // Bytes returns the address of a []byte field in the struct. |
| 103 | func structPointer_Bytes(p structPointer, f field) *[]byte { |
| 104 | return structPointer_ifield(p, f).(*[]byte) |
| 105 | } |
| 106 | |
| 107 | // BytesSlice returns the address of a [][]byte field in the struct. |
| 108 | func structPointer_BytesSlice(p structPointer, f field) *[][]byte { |
| 109 | return structPointer_ifield(p, f).(*[][]byte) |
| 110 | } |
| 111 | |
| 112 | // Bool returns the address of a *bool field in the struct. |
| 113 | func structPointer_Bool(p structPointer, f field) **bool { |
| 114 | return structPointer_ifield(p, f).(**bool) |
| 115 | } |
| 116 | |
| 117 | // BoolVal returns the address of a bool field in the struct. |
| 118 | func structPointer_BoolVal(p structPointer, f field) *bool { |
| 119 | return structPointer_ifield(p, f).(*bool) |
| 120 | } |
| 121 | |
| 122 | // BoolSlice returns the address of a []bool field in the struct. |
| 123 | func structPointer_BoolSlice(p structPointer, f field) *[]bool { |
| 124 | return structPointer_ifield(p, f).(*[]bool) |
| 125 | } |
| 126 | |
| 127 | // String returns the address of a *string field in the struct. |
| 128 | func structPointer_String(p structPointer, f field) **string { |
| 129 | return structPointer_ifield(p, f).(**string) |
| 130 | } |
| 131 | |
| 132 | // StringVal returns the address of a string field in the struct. |
| 133 | func structPointer_StringVal(p structPointer, f field) *string { |
| 134 | return structPointer_ifield(p, f).(*string) |
| 135 | } |
| 136 | |
| 137 | // StringSlice returns the address of a []string field in the struct. |
| 138 | func structPointer_StringSlice(p structPointer, f field) *[]string { |
| 139 | return structPointer_ifield(p, f).(*[]string) |
| 140 | } |
| 141 | |
| 142 | // Extensions returns the address of an extension map field in the struct. |
| 143 | func structPointer_Extensions(p structPointer, f field) *XXX_InternalExtensions { |
| 144 | return structPointer_ifield(p, f).(*XXX_InternalExtensions) |
| 145 | } |
| 146 | |
| 147 | // ExtMap returns the address of an extension map field in the struct. |
| 148 | func structPointer_ExtMap(p structPointer, f field) *map[int32]Extension { |
| 149 | return structPointer_ifield(p, f).(*map[int32]Extension) |
| 150 | } |
| 151 | |
| 152 | // NewAt returns the reflect.Value for a pointer to a field in the struct. |
| 153 | func structPointer_NewAt(p structPointer, f field, typ reflect.Type) reflect.Value { |
| 154 | return structPointer_field(p, f).Addr() |
| 155 | } |
| 156 | |
| 157 | // SetStructPointer writes a *struct field in the struct. |
| 158 | func structPointer_SetStructPointer(p structPointer, f field, q structPointer) { |
| 159 | structPointer_field(p, f).Set(q.v) |
| 160 | } |
| 161 | |
| 162 | // GetStructPointer reads a *struct field in the struct. |
| 163 | func structPointer_GetStructPointer(p structPointer, f field) structPointer { |
| 164 | return structPointer{structPointer_field(p, f)} |
| 165 | } |
| 166 | |
| 167 | // StructPointerSlice the address of a []*struct field in the struct. |
| 168 | func structPointer_StructPointerSlice(p structPointer, f field) structPointerSlice { |
| 169 | return structPointerSlice{structPointer_field(p, f)} |
| 170 | } |
| 171 | |
| 172 | // A structPointerSlice represents the address of a slice of pointers to structs |
| 173 | // (themselves messages or groups). That is, v.Type() is *[]*struct{...}. |
| 174 | type structPointerSlice struct { |
| 175 | v reflect.Value |
| 176 | } |
| 177 | |
| 178 | func (p structPointerSlice) Len() int { return p.v.Len() } |
| 179 | func (p structPointerSlice) Index(i int) structPointer { return structPointer{p.v.Index(i)} } |
| 180 | func (p structPointerSlice) Append(q structPointer) { |
| 181 | p.v.Set(reflect.Append(p.v, q.v)) |
| 182 | } |
| 183 | |
| 184 | var ( |
| 185 | int32Type = reflect.TypeOf(int32(0)) |
| 186 | uint32Type = reflect.TypeOf(uint32(0)) |
| 187 | float32Type = reflect.TypeOf(float32(0)) |
| 188 | int64Type = reflect.TypeOf(int64(0)) |
| 189 | uint64Type = reflect.TypeOf(uint64(0)) |
| 190 | float64Type = reflect.TypeOf(float64(0)) |
| 191 | ) |
| 192 | |
| 193 | // A word32 represents a field of type *int32, *uint32, *float32, or *enum. |
| 194 | // That is, v.Type() is *int32, *uint32, *float32, or *enum and v is assignable. |
| 195 | type word32 struct { |
| 196 | v reflect.Value |
| 197 | } |
| 198 | |
| 199 | // IsNil reports whether p is nil. |
| 200 | func word32_IsNil(p word32) bool { |
| 201 | return p.v.IsNil() |
| 202 | } |
| 203 | |
| 204 | // Set sets p to point at a newly allocated word with bits set to x. |
| 205 | func word32_Set(p word32, o *Buffer, x uint32) { |
| 206 | t := p.v.Type().Elem() |
| 207 | switch t { |
| 208 | case int32Type: |
| 209 | if len(o.int32s) == 0 { |
| 210 | o.int32s = make([]int32, uint32PoolSize) |
| 211 | } |
| 212 | o.int32s[0] = int32(x) |
| 213 | p.v.Set(reflect.ValueOf(&o.int32s[0])) |
| 214 | o.int32s = o.int32s[1:] |
| 215 | return |
| 216 | case uint32Type: |
| 217 | if len(o.uint32s) == 0 { |
| 218 | o.uint32s = make([]uint32, uint32PoolSize) |
| 219 | } |
| 220 | o.uint32s[0] = x |
| 221 | p.v.Set(reflect.ValueOf(&o.uint32s[0])) |
| 222 | o.uint32s = o.uint32s[1:] |
| 223 | return |
| 224 | case float32Type: |
| 225 | if len(o.float32s) == 0 { |
| 226 | o.float32s = make([]float32, uint32PoolSize) |
| 227 | } |
| 228 | o.float32s[0] = math.Float32frombits(x) |
| 229 | p.v.Set(reflect.ValueOf(&o.float32s[0])) |
| 230 | o.float32s = o.float32s[1:] |
| 231 | return |
| 232 | } |
| 233 | |
| 234 | // must be enum |
| 235 | p.v.Set(reflect.New(t)) |
| 236 | p.v.Elem().SetInt(int64(int32(x))) |
| 237 | } |
| 238 | |
| 239 | // Get gets the bits pointed at by p, as a uint32. |
| 240 | func word32_Get(p word32) uint32 { |
| 241 | elem := p.v.Elem() |
| 242 | switch elem.Kind() { |
| 243 | case reflect.Int32: |
| 244 | return uint32(elem.Int()) |
| 245 | case reflect.Uint32: |
| 246 | return uint32(elem.Uint()) |
| 247 | case reflect.Float32: |
| 248 | return math.Float32bits(float32(elem.Float())) |
| 249 | } |
| 250 | panic("unreachable") |
| 251 | } |
| 252 | |
| 253 | // Word32 returns a reference to a *int32, *uint32, *float32, or *enum field in the struct. |
| 254 | func structPointer_Word32(p structPointer, f field) word32 { |
| 255 | return word32{structPointer_field(p, f)} |
| 256 | } |
| 257 | |
| 258 | // A word32Val represents a field of type int32, uint32, float32, or enum. |
| 259 | // That is, v.Type() is int32, uint32, float32, or enum and v is assignable. |
| 260 | type word32Val struct { |
| 261 | v reflect.Value |
| 262 | } |
| 263 | |
| 264 | // Set sets *p to x. |
| 265 | func word32Val_Set(p word32Val, x uint32) { |
| 266 | switch p.v.Type() { |
| 267 | case int32Type: |
| 268 | p.v.SetInt(int64(x)) |
| 269 | return |
| 270 | case uint32Type: |
| 271 | p.v.SetUint(uint64(x)) |
| 272 | return |
| 273 | case float32Type: |
| 274 | p.v.SetFloat(float64(math.Float32frombits(x))) |
| 275 | return |
| 276 | } |
| 277 | |
| 278 | // must be enum |
| 279 | p.v.SetInt(int64(int32(x))) |
| 280 | } |
| 281 | |
| 282 | // Get gets the bits pointed at by p, as a uint32. |
| 283 | func word32Val_Get(p word32Val) uint32 { |
| 284 | elem := p.v |
| 285 | switch elem.Kind() { |
| 286 | case reflect.Int32: |
| 287 | return uint32(elem.Int()) |
| 288 | case reflect.Uint32: |
| 289 | return uint32(elem.Uint()) |
| 290 | case reflect.Float32: |
| 291 | return math.Float32bits(float32(elem.Float())) |
| 292 | } |
| 293 | panic("unreachable") |
| 294 | } |
| 295 | |
| 296 | // Word32Val returns a reference to a int32, uint32, float32, or enum field in the struct. |
| 297 | func structPointer_Word32Val(p structPointer, f field) word32Val { |
| 298 | return word32Val{structPointer_field(p, f)} |
| 299 | } |
| 300 | |
| 301 | // A word32Slice is a slice of 32-bit values. |
| 302 | // That is, v.Type() is []int32, []uint32, []float32, or []enum. |
| 303 | type word32Slice struct { |
| 304 | v reflect.Value |
| 305 | } |
| 306 | |
| 307 | func (p word32Slice) Append(x uint32) { |
| 308 | n, m := p.v.Len(), p.v.Cap() |
| 309 | if n < m { |
| 310 | p.v.SetLen(n + 1) |
| 311 | } else { |
| 312 | t := p.v.Type().Elem() |
| 313 | p.v.Set(reflect.Append(p.v, reflect.Zero(t))) |
| 314 | } |
| 315 | elem := p.v.Index(n) |
| 316 | switch elem.Kind() { |
| 317 | case reflect.Int32: |
| 318 | elem.SetInt(int64(int32(x))) |
| 319 | case reflect.Uint32: |
| 320 | elem.SetUint(uint64(x)) |
| 321 | case reflect.Float32: |
| 322 | elem.SetFloat(float64(math.Float32frombits(x))) |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | func (p word32Slice) Len() int { |
| 327 | return p.v.Len() |
| 328 | } |
| 329 | |
| 330 | func (p word32Slice) Index(i int) uint32 { |
| 331 | elem := p.v.Index(i) |
| 332 | switch elem.Kind() { |
| 333 | case reflect.Int32: |
| 334 | return uint32(elem.Int()) |
| 335 | case reflect.Uint32: |
| 336 | return uint32(elem.Uint()) |
| 337 | case reflect.Float32: |
| 338 | return math.Float32bits(float32(elem.Float())) |
| 339 | } |
| 340 | panic("unreachable") |
| 341 | } |
| 342 | |
| 343 | // Word32Slice returns a reference to a []int32, []uint32, []float32, or []enum field in the struct. |
| 344 | func structPointer_Word32Slice(p structPointer, f field) word32Slice { |
| 345 | return word32Slice{structPointer_field(p, f)} |
| 346 | } |
| 347 | |
| 348 | // word64 is like word32 but for 64-bit values. |
| 349 | type word64 struct { |
| 350 | v reflect.Value |
| 351 | } |
| 352 | |
| 353 | func word64_Set(p word64, o *Buffer, x uint64) { |
| 354 | t := p.v.Type().Elem() |
| 355 | switch t { |
| 356 | case int64Type: |
| 357 | if len(o.int64s) == 0 { |
| 358 | o.int64s = make([]int64, uint64PoolSize) |
| 359 | } |
| 360 | o.int64s[0] = int64(x) |
| 361 | p.v.Set(reflect.ValueOf(&o.int64s[0])) |
| 362 | o.int64s = o.int64s[1:] |
| 363 | return |
| 364 | case uint64Type: |
| 365 | if len(o.uint64s) == 0 { |
| 366 | o.uint64s = make([]uint64, uint64PoolSize) |
| 367 | } |
| 368 | o.uint64s[0] = x |
| 369 | p.v.Set(reflect.ValueOf(&o.uint64s[0])) |
| 370 | o.uint64s = o.uint64s[1:] |
| 371 | return |
| 372 | case float64Type: |
| 373 | if len(o.float64s) == 0 { |
| 374 | o.float64s = make([]float64, uint64PoolSize) |
| 375 | } |
| 376 | o.float64s[0] = math.Float64frombits(x) |
| 377 | p.v.Set(reflect.ValueOf(&o.float64s[0])) |
| 378 | o.float64s = o.float64s[1:] |
| 379 | return |
| 380 | } |
| 381 | panic("unreachable") |
| 382 | } |
| 383 | |
| 384 | func word64_IsNil(p word64) bool { |
| 385 | return p.v.IsNil() |
| 386 | } |
| 387 | |
| 388 | func word64_Get(p word64) uint64 { |
| 389 | elem := p.v.Elem() |
| 390 | switch elem.Kind() { |
| 391 | case reflect.Int64: |
| 392 | return uint64(elem.Int()) |
| 393 | case reflect.Uint64: |
| 394 | return elem.Uint() |
| 395 | case reflect.Float64: |
| 396 | return math.Float64bits(elem.Float()) |
| 397 | } |
| 398 | panic("unreachable") |
| 399 | } |
| 400 | |
| 401 | func structPointer_Word64(p structPointer, f field) word64 { |
| 402 | return word64{structPointer_field(p, f)} |
| 403 | } |
| 404 | |
| 405 | // word64Val is like word32Val but for 64-bit values. |
| 406 | type word64Val struct { |
| 407 | v reflect.Value |
| 408 | } |
| 409 | |
| 410 | func word64Val_Set(p word64Val, o *Buffer, x uint64) { |
| 411 | switch p.v.Type() { |
| 412 | case int64Type: |
| 413 | p.v.SetInt(int64(x)) |
| 414 | return |
| 415 | case uint64Type: |
| 416 | p.v.SetUint(x) |
| 417 | return |
| 418 | case float64Type: |
| 419 | p.v.SetFloat(math.Float64frombits(x)) |
| 420 | return |
| 421 | } |
| 422 | panic("unreachable") |
| 423 | } |
| 424 | |
| 425 | func word64Val_Get(p word64Val) uint64 { |
| 426 | elem := p.v |
| 427 | switch elem.Kind() { |
| 428 | case reflect.Int64: |
| 429 | return uint64(elem.Int()) |
| 430 | case reflect.Uint64: |
| 431 | return elem.Uint() |
| 432 | case reflect.Float64: |
| 433 | return math.Float64bits(elem.Float()) |
| 434 | } |
| 435 | panic("unreachable") |
| 436 | } |
| 437 | |
| 438 | func structPointer_Word64Val(p structPointer, f field) word64Val { |
| 439 | return word64Val{structPointer_field(p, f)} |
| 440 | } |
| 441 | |
| 442 | type word64Slice struct { |
| 443 | v reflect.Value |
| 444 | } |
| 445 | |
| 446 | func (p word64Slice) Append(x uint64) { |
| 447 | n, m := p.v.Len(), p.v.Cap() |
| 448 | if n < m { |
| 449 | p.v.SetLen(n + 1) |
| 450 | } else { |
| 451 | t := p.v.Type().Elem() |
| 452 | p.v.Set(reflect.Append(p.v, reflect.Zero(t))) |
| 453 | } |
| 454 | elem := p.v.Index(n) |
| 455 | switch elem.Kind() { |
| 456 | case reflect.Int64: |
| 457 | elem.SetInt(int64(int64(x))) |
| 458 | case reflect.Uint64: |
| 459 | elem.SetUint(uint64(x)) |
| 460 | case reflect.Float64: |
| 461 | elem.SetFloat(float64(math.Float64frombits(x))) |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | func (p word64Slice) Len() int { |
| 466 | return p.v.Len() |
| 467 | } |
| 468 | |
| 469 | func (p word64Slice) Index(i int) uint64 { |
| 470 | elem := p.v.Index(i) |
| 471 | switch elem.Kind() { |
| 472 | case reflect.Int64: |
| 473 | return uint64(elem.Int()) |
| 474 | case reflect.Uint64: |
| 475 | return uint64(elem.Uint()) |
| 476 | case reflect.Float64: |
| 477 | return math.Float64bits(float64(elem.Float())) |
| 478 | } |
| 479 | panic("unreachable") |
| 480 | } |
| 481 | |
| 482 | func structPointer_Word64Slice(p structPointer, f field) word64Slice { |
| 483 | return word64Slice{structPointer_field(p, f)} |
| 484 | } |