github.com/comwrg/go/src@v0.0.0-20220319063731-c238d0440370/reflect/all_test.go (about) 1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package reflect_test 6 7 import ( 8 "bytes" 9 "encoding/base64" 10 "flag" 11 "fmt" 12 "go/token" 13 "io" 14 "math" 15 "math/rand" 16 "os" 17 . "reflect" 18 "reflect/internal/example1" 19 "reflect/internal/example2" 20 "runtime" 21 "sort" 22 "strconv" 23 "strings" 24 "sync" 25 "sync/atomic" 26 "testing" 27 "time" 28 "unsafe" 29 ) 30 31 var sink interface{} 32 33 func TestBool(t *testing.T) { 34 v := ValueOf(true) 35 if v.Bool() != true { 36 t.Fatal("ValueOf(true).Bool() = false") 37 } 38 } 39 40 type integer int 41 type T struct { 42 a int 43 b float64 44 c string 45 d *int 46 } 47 48 type pair struct { 49 i interface{} 50 s string 51 } 52 53 func assert(t *testing.T, s, want string) { 54 if s != want { 55 t.Errorf("have %#q want %#q", s, want) 56 } 57 } 58 59 var typeTests = []pair{ 60 {struct{ x int }{}, "int"}, 61 {struct{ x int8 }{}, "int8"}, 62 {struct{ x int16 }{}, "int16"}, 63 {struct{ x int32 }{}, "int32"}, 64 {struct{ x int64 }{}, "int64"}, 65 {struct{ x uint }{}, "uint"}, 66 {struct{ x uint8 }{}, "uint8"}, 67 {struct{ x uint16 }{}, "uint16"}, 68 {struct{ x uint32 }{}, "uint32"}, 69 {struct{ x uint64 }{}, "uint64"}, 70 {struct{ x float32 }{}, "float32"}, 71 {struct{ x float64 }{}, "float64"}, 72 {struct{ x int8 }{}, "int8"}, 73 {struct{ x (**int8) }{}, "**int8"}, 74 {struct{ x (**integer) }{}, "**reflect_test.integer"}, 75 {struct{ x ([32]int32) }{}, "[32]int32"}, 76 {struct{ x ([]int8) }{}, "[]int8"}, 77 {struct{ x (map[string]int32) }{}, "map[string]int32"}, 78 {struct{ x (chan<- string) }{}, "chan<- string"}, 79 {struct{ x (chan<- chan string) }{}, "chan<- chan string"}, 80 {struct{ x (chan<- <-chan string) }{}, "chan<- <-chan string"}, 81 {struct{ x (<-chan <-chan string) }{}, "<-chan <-chan string"}, 82 {struct{ x (chan (<-chan string)) }{}, "chan (<-chan string)"}, 83 {struct { 84 x struct { 85 c chan *int32 86 d float32 87 } 88 }{}, 89 "struct { c chan *int32; d float32 }", 90 }, 91 {struct{ x (func(a int8, b int32)) }{}, "func(int8, int32)"}, 92 {struct { 93 x struct { 94 c func(chan *integer, *int8) 95 } 96 }{}, 97 "struct { c func(chan *reflect_test.integer, *int8) }", 98 }, 99 {struct { 100 x struct { 101 a int8 102 b int32 103 } 104 }{}, 105 "struct { a int8; b int32 }", 106 }, 107 {struct { 108 x struct { 109 a int8 110 b int8 111 c int32 112 } 113 }{}, 114 "struct { a int8; b int8; c int32 }", 115 }, 116 {struct { 117 x struct { 118 a int8 119 b int8 120 c int8 121 d int32 122 } 123 }{}, 124 "struct { a int8; b int8; c int8; d int32 }", 125 }, 126 {struct { 127 x struct { 128 a int8 129 b int8 130 c int8 131 d int8 132 e int32 133 } 134 }{}, 135 "struct { a int8; b int8; c int8; d int8; e int32 }", 136 }, 137 {struct { 138 x struct { 139 a int8 140 b int8 141 c int8 142 d int8 143 e int8 144 f int32 145 } 146 }{}, 147 "struct { a int8; b int8; c int8; d int8; e int8; f int32 }", 148 }, 149 {struct { 150 x struct { 151 a int8 `reflect:"hi there"` 152 } 153 }{}, 154 `struct { a int8 "reflect:\"hi there\"" }`, 155 }, 156 {struct { 157 x struct { 158 a int8 `reflect:"hi \x00there\t\n\"\\"` 159 } 160 }{}, 161 `struct { a int8 "reflect:\"hi \\x00there\\t\\n\\\"\\\\\"" }`, 162 }, 163 {struct { 164 x struct { 165 f func(args ...int) 166 } 167 }{}, 168 "struct { f func(...int) }", 169 }, 170 {struct { 171 x (interface { 172 a(func(func(int) int) func(func(int)) int) 173 b() 174 }) 175 }{}, 176 "interface { reflect_test.a(func(func(int) int) func(func(int)) int); reflect_test.b() }", 177 }, 178 {struct { 179 x struct { 180 int32 181 int64 182 } 183 }{}, 184 "struct { int32; int64 }", 185 }, 186 } 187 188 var valueTests = []pair{ 189 {new(int), "132"}, 190 {new(int8), "8"}, 191 {new(int16), "16"}, 192 {new(int32), "32"}, 193 {new(int64), "64"}, 194 {new(uint), "132"}, 195 {new(uint8), "8"}, 196 {new(uint16), "16"}, 197 {new(uint32), "32"}, 198 {new(uint64), "64"}, 199 {new(float32), "256.25"}, 200 {new(float64), "512.125"}, 201 {new(complex64), "532.125+10i"}, 202 {new(complex128), "564.25+1i"}, 203 {new(string), "stringy cheese"}, 204 {new(bool), "true"}, 205 {new(*int8), "*int8(0)"}, 206 {new(**int8), "**int8(0)"}, 207 {new([5]int32), "[5]int32{0, 0, 0, 0, 0}"}, 208 {new(**integer), "**reflect_test.integer(0)"}, 209 {new(map[string]int32), "map[string]int32{<can't iterate on maps>}"}, 210 {new(chan<- string), "chan<- string"}, 211 {new(func(a int8, b int32)), "func(int8, int32)(0)"}, 212 {new(struct { 213 c chan *int32 214 d float32 215 }), 216 "struct { c chan *int32; d float32 }{chan *int32, 0}", 217 }, 218 {new(struct{ c func(chan *integer, *int8) }), 219 "struct { c func(chan *reflect_test.integer, *int8) }{func(chan *reflect_test.integer, *int8)(0)}", 220 }, 221 {new(struct { 222 a int8 223 b int32 224 }), 225 "struct { a int8; b int32 }{0, 0}", 226 }, 227 {new(struct { 228 a int8 229 b int8 230 c int32 231 }), 232 "struct { a int8; b int8; c int32 }{0, 0, 0}", 233 }, 234 } 235 236 func testType(t *testing.T, i int, typ Type, want string) { 237 s := typ.String() 238 if s != want { 239 t.Errorf("#%d: have %#q, want %#q", i, s, want) 240 } 241 } 242 243 func TestTypes(t *testing.T) { 244 for i, tt := range typeTests { 245 testType(t, i, ValueOf(tt.i).Field(0).Type(), tt.s) 246 } 247 } 248 249 func TestSet(t *testing.T) { 250 for i, tt := range valueTests { 251 v := ValueOf(tt.i) 252 v = v.Elem() 253 switch v.Kind() { 254 case Int: 255 v.SetInt(132) 256 case Int8: 257 v.SetInt(8) 258 case Int16: 259 v.SetInt(16) 260 case Int32: 261 v.SetInt(32) 262 case Int64: 263 v.SetInt(64) 264 case Uint: 265 v.SetUint(132) 266 case Uint8: 267 v.SetUint(8) 268 case Uint16: 269 v.SetUint(16) 270 case Uint32: 271 v.SetUint(32) 272 case Uint64: 273 v.SetUint(64) 274 case Float32: 275 v.SetFloat(256.25) 276 case Float64: 277 v.SetFloat(512.125) 278 case Complex64: 279 v.SetComplex(532.125 + 10i) 280 case Complex128: 281 v.SetComplex(564.25 + 1i) 282 case String: 283 v.SetString("stringy cheese") 284 case Bool: 285 v.SetBool(true) 286 } 287 s := valueToString(v) 288 if s != tt.s { 289 t.Errorf("#%d: have %#q, want %#q", i, s, tt.s) 290 } 291 } 292 } 293 294 func TestSetValue(t *testing.T) { 295 for i, tt := range valueTests { 296 v := ValueOf(tt.i).Elem() 297 switch v.Kind() { 298 case Int: 299 v.Set(ValueOf(int(132))) 300 case Int8: 301 v.Set(ValueOf(int8(8))) 302 case Int16: 303 v.Set(ValueOf(int16(16))) 304 case Int32: 305 v.Set(ValueOf(int32(32))) 306 case Int64: 307 v.Set(ValueOf(int64(64))) 308 case Uint: 309 v.Set(ValueOf(uint(132))) 310 case Uint8: 311 v.Set(ValueOf(uint8(8))) 312 case Uint16: 313 v.Set(ValueOf(uint16(16))) 314 case Uint32: 315 v.Set(ValueOf(uint32(32))) 316 case Uint64: 317 v.Set(ValueOf(uint64(64))) 318 case Float32: 319 v.Set(ValueOf(float32(256.25))) 320 case Float64: 321 v.Set(ValueOf(512.125)) 322 case Complex64: 323 v.Set(ValueOf(complex64(532.125 + 10i))) 324 case Complex128: 325 v.Set(ValueOf(complex128(564.25 + 1i))) 326 case String: 327 v.Set(ValueOf("stringy cheese")) 328 case Bool: 329 v.Set(ValueOf(true)) 330 } 331 s := valueToString(v) 332 if s != tt.s { 333 t.Errorf("#%d: have %#q, want %#q", i, s, tt.s) 334 } 335 } 336 } 337 338 func TestCanSetField(t *testing.T) { 339 type embed struct{ x, X int } 340 type Embed struct{ x, X int } 341 type S1 struct { 342 embed 343 x, X int 344 } 345 type S2 struct { 346 *embed 347 x, X int 348 } 349 type S3 struct { 350 Embed 351 x, X int 352 } 353 type S4 struct { 354 *Embed 355 x, X int 356 } 357 358 type testCase struct { 359 // -1 means Addr().Elem() of current value 360 index []int 361 canSet bool 362 } 363 tests := []struct { 364 val Value 365 cases []testCase 366 }{{ 367 val: ValueOf(&S1{}), 368 cases: []testCase{ 369 {[]int{0}, false}, 370 {[]int{0, -1}, false}, 371 {[]int{0, 0}, false}, 372 {[]int{0, 0, -1}, false}, 373 {[]int{0, -1, 0}, false}, 374 {[]int{0, -1, 0, -1}, false}, 375 {[]int{0, 1}, true}, 376 {[]int{0, 1, -1}, true}, 377 {[]int{0, -1, 1}, true}, 378 {[]int{0, -1, 1, -1}, true}, 379 {[]int{1}, false}, 380 {[]int{1, -1}, false}, 381 {[]int{2}, true}, 382 {[]int{2, -1}, true}, 383 }, 384 }, { 385 val: ValueOf(&S2{embed: &embed{}}), 386 cases: []testCase{ 387 {[]int{0}, false}, 388 {[]int{0, -1}, false}, 389 {[]int{0, 0}, false}, 390 {[]int{0, 0, -1}, false}, 391 {[]int{0, -1, 0}, false}, 392 {[]int{0, -1, 0, -1}, false}, 393 {[]int{0, 1}, true}, 394 {[]int{0, 1, -1}, true}, 395 {[]int{0, -1, 1}, true}, 396 {[]int{0, -1, 1, -1}, true}, 397 {[]int{1}, false}, 398 {[]int{2}, true}, 399 }, 400 }, { 401 val: ValueOf(&S3{}), 402 cases: []testCase{ 403 {[]int{0}, true}, 404 {[]int{0, -1}, true}, 405 {[]int{0, 0}, false}, 406 {[]int{0, 0, -1}, false}, 407 {[]int{0, -1, 0}, false}, 408 {[]int{0, -1, 0, -1}, false}, 409 {[]int{0, 1}, true}, 410 {[]int{0, 1, -1}, true}, 411 {[]int{0, -1, 1}, true}, 412 {[]int{0, -1, 1, -1}, true}, 413 {[]int{1}, false}, 414 {[]int{2}, true}, 415 }, 416 }, { 417 val: ValueOf(&S4{Embed: &Embed{}}), 418 cases: []testCase{ 419 {[]int{0}, true}, 420 {[]int{0, -1}, true}, 421 {[]int{0, 0}, false}, 422 {[]int{0, 0, -1}, false}, 423 {[]int{0, -1, 0}, false}, 424 {[]int{0, -1, 0, -1}, false}, 425 {[]int{0, 1}, true}, 426 {[]int{0, 1, -1}, true}, 427 {[]int{0, -1, 1}, true}, 428 {[]int{0, -1, 1, -1}, true}, 429 {[]int{1}, false}, 430 {[]int{2}, true}, 431 }, 432 }} 433 434 for _, tt := range tests { 435 t.Run(tt.val.Type().Name(), func(t *testing.T) { 436 for _, tc := range tt.cases { 437 f := tt.val 438 for _, i := range tc.index { 439 if f.Kind() == Ptr { 440 f = f.Elem() 441 } 442 if i == -1 { 443 f = f.Addr().Elem() 444 } else { 445 f = f.Field(i) 446 } 447 } 448 if got := f.CanSet(); got != tc.canSet { 449 t.Errorf("CanSet() = %v, want %v", got, tc.canSet) 450 } 451 } 452 }) 453 } 454 } 455 456 var _i = 7 457 458 var valueToStringTests = []pair{ 459 {123, "123"}, 460 {123.5, "123.5"}, 461 {byte(123), "123"}, 462 {"abc", "abc"}, 463 {T{123, 456.75, "hello", &_i}, "reflect_test.T{123, 456.75, hello, *int(&7)}"}, 464 {new(chan *T), "*chan *reflect_test.T(&chan *reflect_test.T)"}, 465 {[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"}, 466 {&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[10]int(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"}, 467 {[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"}, 468 {&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[]int(&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"}, 469 } 470 471 func TestValueToString(t *testing.T) { 472 for i, test := range valueToStringTests { 473 s := valueToString(ValueOf(test.i)) 474 if s != test.s { 475 t.Errorf("#%d: have %#q, want %#q", i, s, test.s) 476 } 477 } 478 } 479 480 func TestArrayElemSet(t *testing.T) { 481 v := ValueOf(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}).Elem() 482 v.Index(4).SetInt(123) 483 s := valueToString(v) 484 const want = "[10]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}" 485 if s != want { 486 t.Errorf("[10]int: have %#q want %#q", s, want) 487 } 488 489 v = ValueOf([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}) 490 v.Index(4).SetInt(123) 491 s = valueToString(v) 492 const want1 = "[]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}" 493 if s != want1 { 494 t.Errorf("[]int: have %#q want %#q", s, want1) 495 } 496 } 497 498 func TestPtrPointTo(t *testing.T) { 499 var ip *int32 500 var i int32 = 1234 501 vip := ValueOf(&ip) 502 vi := ValueOf(&i).Elem() 503 vip.Elem().Set(vi.Addr()) 504 if *ip != 1234 { 505 t.Errorf("got %d, want 1234", *ip) 506 } 507 508 ip = nil 509 vp := ValueOf(&ip).Elem() 510 vp.Set(Zero(vp.Type())) 511 if ip != nil { 512 t.Errorf("got non-nil (%p), want nil", ip) 513 } 514 } 515 516 func TestPtrSetNil(t *testing.T) { 517 var i int32 = 1234 518 ip := &i 519 vip := ValueOf(&ip) 520 vip.Elem().Set(Zero(vip.Elem().Type())) 521 if ip != nil { 522 t.Errorf("got non-nil (%d), want nil", *ip) 523 } 524 } 525 526 func TestMapSetNil(t *testing.T) { 527 m := make(map[string]int) 528 vm := ValueOf(&m) 529 vm.Elem().Set(Zero(vm.Elem().Type())) 530 if m != nil { 531 t.Errorf("got non-nil (%p), want nil", m) 532 } 533 } 534 535 func TestAll(t *testing.T) { 536 testType(t, 1, TypeOf((int8)(0)), "int8") 537 testType(t, 2, TypeOf((*int8)(nil)).Elem(), "int8") 538 539 typ := TypeOf((*struct { 540 c chan *int32 541 d float32 542 })(nil)) 543 testType(t, 3, typ, "*struct { c chan *int32; d float32 }") 544 etyp := typ.Elem() 545 testType(t, 4, etyp, "struct { c chan *int32; d float32 }") 546 styp := etyp 547 f := styp.Field(0) 548 testType(t, 5, f.Type, "chan *int32") 549 550 f, present := styp.FieldByName("d") 551 if !present { 552 t.Errorf("FieldByName says present field is absent") 553 } 554 testType(t, 6, f.Type, "float32") 555 556 f, present = styp.FieldByName("absent") 557 if present { 558 t.Errorf("FieldByName says absent field is present") 559 } 560 561 typ = TypeOf([32]int32{}) 562 testType(t, 7, typ, "[32]int32") 563 testType(t, 8, typ.Elem(), "int32") 564 565 typ = TypeOf((map[string]*int32)(nil)) 566 testType(t, 9, typ, "map[string]*int32") 567 mtyp := typ 568 testType(t, 10, mtyp.Key(), "string") 569 testType(t, 11, mtyp.Elem(), "*int32") 570 571 typ = TypeOf((chan<- string)(nil)) 572 testType(t, 12, typ, "chan<- string") 573 testType(t, 13, typ.Elem(), "string") 574 575 // make sure tag strings are not part of element type 576 typ = TypeOf(struct { 577 d []uint32 `reflect:"TAG"` 578 }{}).Field(0).Type 579 testType(t, 14, typ, "[]uint32") 580 } 581 582 func TestInterfaceGet(t *testing.T) { 583 var inter struct { 584 E interface{} 585 } 586 inter.E = 123.456 587 v1 := ValueOf(&inter) 588 v2 := v1.Elem().Field(0) 589 assert(t, v2.Type().String(), "interface {}") 590 i2 := v2.Interface() 591 v3 := ValueOf(i2) 592 assert(t, v3.Type().String(), "float64") 593 } 594 595 func TestInterfaceValue(t *testing.T) { 596 var inter struct { 597 E interface{} 598 } 599 inter.E = 123.456 600 v1 := ValueOf(&inter) 601 v2 := v1.Elem().Field(0) 602 assert(t, v2.Type().String(), "interface {}") 603 v3 := v2.Elem() 604 assert(t, v3.Type().String(), "float64") 605 606 i3 := v2.Interface() 607 if _, ok := i3.(float64); !ok { 608 t.Error("v2.Interface() did not return float64, got ", TypeOf(i3)) 609 } 610 } 611 612 func TestFunctionValue(t *testing.T) { 613 var x interface{} = func() {} 614 v := ValueOf(x) 615 if fmt.Sprint(v.Interface()) != fmt.Sprint(x) { 616 t.Fatalf("TestFunction returned wrong pointer") 617 } 618 assert(t, v.Type().String(), "func()") 619 } 620 621 var appendTests = []struct { 622 orig, extra []int 623 }{ 624 {make([]int, 2, 4), []int{22}}, 625 {make([]int, 2, 4), []int{22, 33, 44}}, 626 } 627 628 func sameInts(x, y []int) bool { 629 if len(x) != len(y) { 630 return false 631 } 632 for i, xx := range x { 633 if xx != y[i] { 634 return false 635 } 636 } 637 return true 638 } 639 640 func TestAppend(t *testing.T) { 641 for i, test := range appendTests { 642 origLen, extraLen := len(test.orig), len(test.extra) 643 want := append(test.orig, test.extra...) 644 // Convert extra from []int to []Value. 645 e0 := make([]Value, len(test.extra)) 646 for j, e := range test.extra { 647 e0[j] = ValueOf(e) 648 } 649 // Convert extra from []int to *SliceValue. 650 e1 := ValueOf(test.extra) 651 // Test Append. 652 a0 := ValueOf(test.orig) 653 have0 := Append(a0, e0...).Interface().([]int) 654 if !sameInts(have0, want) { 655 t.Errorf("Append #%d: have %v, want %v (%p %p)", i, have0, want, test.orig, have0) 656 } 657 // Check that the orig and extra slices were not modified. 658 if len(test.orig) != origLen { 659 t.Errorf("Append #%d origLen: have %v, want %v", i, len(test.orig), origLen) 660 } 661 if len(test.extra) != extraLen { 662 t.Errorf("Append #%d extraLen: have %v, want %v", i, len(test.extra), extraLen) 663 } 664 // Test AppendSlice. 665 a1 := ValueOf(test.orig) 666 have1 := AppendSlice(a1, e1).Interface().([]int) 667 if !sameInts(have1, want) { 668 t.Errorf("AppendSlice #%d: have %v, want %v", i, have1, want) 669 } 670 // Check that the orig and extra slices were not modified. 671 if len(test.orig) != origLen { 672 t.Errorf("AppendSlice #%d origLen: have %v, want %v", i, len(test.orig), origLen) 673 } 674 if len(test.extra) != extraLen { 675 t.Errorf("AppendSlice #%d extraLen: have %v, want %v", i, len(test.extra), extraLen) 676 } 677 } 678 } 679 680 func TestCopy(t *testing.T) { 681 a := []int{1, 2, 3, 4, 10, 9, 8, 7} 682 b := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} 683 c := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} 684 for i := 0; i < len(b); i++ { 685 if b[i] != c[i] { 686 t.Fatalf("b != c before test") 687 } 688 } 689 a1 := a 690 b1 := b 691 aa := ValueOf(&a1).Elem() 692 ab := ValueOf(&b1).Elem() 693 for tocopy := 1; tocopy <= 7; tocopy++ { 694 aa.SetLen(tocopy) 695 Copy(ab, aa) 696 aa.SetLen(8) 697 for i := 0; i < tocopy; i++ { 698 if a[i] != b[i] { 699 t.Errorf("(i) tocopy=%d a[%d]=%d, b[%d]=%d", 700 tocopy, i, a[i], i, b[i]) 701 } 702 } 703 for i := tocopy; i < len(b); i++ { 704 if b[i] != c[i] { 705 if i < len(a) { 706 t.Errorf("(ii) tocopy=%d a[%d]=%d, b[%d]=%d, c[%d]=%d", 707 tocopy, i, a[i], i, b[i], i, c[i]) 708 } else { 709 t.Errorf("(iii) tocopy=%d b[%d]=%d, c[%d]=%d", 710 tocopy, i, b[i], i, c[i]) 711 } 712 } else { 713 t.Logf("tocopy=%d elem %d is okay\n", tocopy, i) 714 } 715 } 716 } 717 } 718 719 func TestCopyString(t *testing.T) { 720 t.Run("Slice", func(t *testing.T) { 721 s := bytes.Repeat([]byte{'_'}, 8) 722 val := ValueOf(s) 723 724 n := Copy(val, ValueOf("")) 725 if expecting := []byte("________"); n != 0 || !bytes.Equal(s, expecting) { 726 t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s, expecting) 727 } 728 729 n = Copy(val, ValueOf("hello")) 730 if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s, expecting) { 731 t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s, expecting) 732 } 733 734 n = Copy(val, ValueOf("helloworld")) 735 if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s, expecting) { 736 t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s, expecting) 737 } 738 }) 739 t.Run("Array", func(t *testing.T) { 740 s := [...]byte{'_', '_', '_', '_', '_', '_', '_', '_'} 741 val := ValueOf(&s).Elem() 742 743 n := Copy(val, ValueOf("")) 744 if expecting := []byte("________"); n != 0 || !bytes.Equal(s[:], expecting) { 745 t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s[:], expecting) 746 } 747 748 n = Copy(val, ValueOf("hello")) 749 if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s[:], expecting) { 750 t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s[:], expecting) 751 } 752 753 n = Copy(val, ValueOf("helloworld")) 754 if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s[:], expecting) { 755 t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s[:], expecting) 756 } 757 }) 758 } 759 760 func TestCopyArray(t *testing.T) { 761 a := [8]int{1, 2, 3, 4, 10, 9, 8, 7} 762 b := [11]int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} 763 c := b 764 aa := ValueOf(&a).Elem() 765 ab := ValueOf(&b).Elem() 766 Copy(ab, aa) 767 for i := 0; i < len(a); i++ { 768 if a[i] != b[i] { 769 t.Errorf("(i) a[%d]=%d, b[%d]=%d", i, a[i], i, b[i]) 770 } 771 } 772 for i := len(a); i < len(b); i++ { 773 if b[i] != c[i] { 774 t.Errorf("(ii) b[%d]=%d, c[%d]=%d", i, b[i], i, c[i]) 775 } else { 776 t.Logf("elem %d is okay\n", i) 777 } 778 } 779 } 780 781 func TestBigUnnamedStruct(t *testing.T) { 782 b := struct{ a, b, c, d int64 }{1, 2, 3, 4} 783 v := ValueOf(b) 784 b1 := v.Interface().(struct { 785 a, b, c, d int64 786 }) 787 if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d { 788 t.Errorf("ValueOf(%v).Interface().(*Big) = %v", b, b1) 789 } 790 } 791 792 type big struct { 793 a, b, c, d, e int64 794 } 795 796 func TestBigStruct(t *testing.T) { 797 b := big{1, 2, 3, 4, 5} 798 v := ValueOf(b) 799 b1 := v.Interface().(big) 800 if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d || b1.e != b.e { 801 t.Errorf("ValueOf(%v).Interface().(big) = %v", b, b1) 802 } 803 } 804 805 type Basic struct { 806 x int 807 y float32 808 } 809 810 type NotBasic Basic 811 812 type DeepEqualTest struct { 813 a, b interface{} 814 eq bool 815 } 816 817 // Simple functions for DeepEqual tests. 818 var ( 819 fn1 func() // nil. 820 fn2 func() // nil. 821 fn3 = func() { fn1() } // Not nil. 822 ) 823 824 type self struct{} 825 826 type Loop *Loop 827 type Loopy interface{} 828 829 var loop1, loop2 Loop 830 var loopy1, loopy2 Loopy 831 var cycleMap1, cycleMap2, cycleMap3 map[string]interface{} 832 833 type structWithSelfPtr struct { 834 p *structWithSelfPtr 835 s string 836 } 837 838 func init() { 839 loop1 = &loop2 840 loop2 = &loop1 841 842 loopy1 = &loopy2 843 loopy2 = &loopy1 844 845 cycleMap1 = map[string]interface{}{} 846 cycleMap1["cycle"] = cycleMap1 847 cycleMap2 = map[string]interface{}{} 848 cycleMap2["cycle"] = cycleMap2 849 cycleMap3 = map[string]interface{}{} 850 cycleMap3["different"] = cycleMap3 851 } 852 853 var deepEqualTests = []DeepEqualTest{ 854 // Equalities 855 {nil, nil, true}, 856 {1, 1, true}, 857 {int32(1), int32(1), true}, 858 {0.5, 0.5, true}, 859 {float32(0.5), float32(0.5), true}, 860 {"hello", "hello", true}, 861 {make([]int, 10), make([]int, 10), true}, 862 {&[3]int{1, 2, 3}, &[3]int{1, 2, 3}, true}, 863 {Basic{1, 0.5}, Basic{1, 0.5}, true}, 864 {error(nil), error(nil), true}, 865 {map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, true}, 866 {fn1, fn2, true}, 867 868 // Inequalities 869 {1, 2, false}, 870 {int32(1), int32(2), false}, 871 {0.5, 0.6, false}, 872 {float32(0.5), float32(0.6), false}, 873 {"hello", "hey", false}, 874 {make([]int, 10), make([]int, 11), false}, 875 {&[3]int{1, 2, 3}, &[3]int{1, 2, 4}, false}, 876 {Basic{1, 0.5}, Basic{1, 0.6}, false}, 877 {Basic{1, 0}, Basic{2, 0}, false}, 878 {map[int]string{1: "one", 3: "two"}, map[int]string{2: "two", 1: "one"}, false}, 879 {map[int]string{1: "one", 2: "txo"}, map[int]string{2: "two", 1: "one"}, false}, 880 {map[int]string{1: "one"}, map[int]string{2: "two", 1: "one"}, false}, 881 {map[int]string{2: "two", 1: "one"}, map[int]string{1: "one"}, false}, 882 {nil, 1, false}, 883 {1, nil, false}, 884 {fn1, fn3, false}, 885 {fn3, fn3, false}, 886 {[][]int{{1}}, [][]int{{2}}, false}, 887 {math.NaN(), math.NaN(), false}, 888 {&[1]float64{math.NaN()}, &[1]float64{math.NaN()}, false}, 889 {&[1]float64{math.NaN()}, self{}, true}, 890 {[]float64{math.NaN()}, []float64{math.NaN()}, false}, 891 {[]float64{math.NaN()}, self{}, true}, 892 {map[float64]float64{math.NaN(): 1}, map[float64]float64{1: 2}, false}, 893 {map[float64]float64{math.NaN(): 1}, self{}, true}, 894 {&structWithSelfPtr{p: &structWithSelfPtr{s: "a"}}, &structWithSelfPtr{p: &structWithSelfPtr{s: "b"}}, false}, 895 896 // Nil vs empty: not the same. 897 {[]int{}, []int(nil), false}, 898 {[]int{}, []int{}, true}, 899 {[]int(nil), []int(nil), true}, 900 {map[int]int{}, map[int]int(nil), false}, 901 {map[int]int{}, map[int]int{}, true}, 902 {map[int]int(nil), map[int]int(nil), true}, 903 904 // Mismatched types 905 {1, 1.0, false}, 906 {int32(1), int64(1), false}, 907 {0.5, "hello", false}, 908 {[]int{1, 2, 3}, [3]int{1, 2, 3}, false}, 909 {&[3]interface{}{1, 2, 4}, &[3]interface{}{1, 2, "s"}, false}, 910 {Basic{1, 0.5}, NotBasic{1, 0.5}, false}, 911 {map[uint]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, false}, 912 913 // Possible loops. 914 {&loop1, &loop1, true}, 915 {&loop1, &loop2, true}, 916 {&loopy1, &loopy1, true}, 917 {&loopy1, &loopy2, true}, 918 {&cycleMap1, &cycleMap2, true}, 919 {&cycleMap1, &cycleMap3, false}, 920 } 921 922 func TestDeepEqual(t *testing.T) { 923 for _, test := range deepEqualTests { 924 if test.b == (self{}) { 925 test.b = test.a 926 } 927 if r := DeepEqual(test.a, test.b); r != test.eq { 928 t.Errorf("DeepEqual(%#v, %#v) = %v, want %v", test.a, test.b, r, test.eq) 929 } 930 } 931 } 932 933 func TestTypeOf(t *testing.T) { 934 // Special case for nil 935 if typ := TypeOf(nil); typ != nil { 936 t.Errorf("expected nil type for nil value; got %v", typ) 937 } 938 for _, test := range deepEqualTests { 939 v := ValueOf(test.a) 940 if !v.IsValid() { 941 continue 942 } 943 typ := TypeOf(test.a) 944 if typ != v.Type() { 945 t.Errorf("TypeOf(%v) = %v, but ValueOf(%v).Type() = %v", test.a, typ, test.a, v.Type()) 946 } 947 } 948 } 949 950 type Recursive struct { 951 x int 952 r *Recursive 953 } 954 955 func TestDeepEqualRecursiveStruct(t *testing.T) { 956 a, b := new(Recursive), new(Recursive) 957 *a = Recursive{12, a} 958 *b = Recursive{12, b} 959 if !DeepEqual(a, b) { 960 t.Error("DeepEqual(recursive same) = false, want true") 961 } 962 } 963 964 type _Complex struct { 965 a int 966 b [3]*_Complex 967 c *string 968 d map[float64]float64 969 } 970 971 func TestDeepEqualComplexStruct(t *testing.T) { 972 m := make(map[float64]float64) 973 stra, strb := "hello", "hello" 974 a, b := new(_Complex), new(_Complex) 975 *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m} 976 *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m} 977 if !DeepEqual(a, b) { 978 t.Error("DeepEqual(complex same) = false, want true") 979 } 980 } 981 982 func TestDeepEqualComplexStructInequality(t *testing.T) { 983 m := make(map[float64]float64) 984 stra, strb := "hello", "helloo" // Difference is here 985 a, b := new(_Complex), new(_Complex) 986 *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m} 987 *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m} 988 if DeepEqual(a, b) { 989 t.Error("DeepEqual(complex different) = true, want false") 990 } 991 } 992 993 type UnexpT struct { 994 m map[int]int 995 } 996 997 func TestDeepEqualUnexportedMap(t *testing.T) { 998 // Check that DeepEqual can look at unexported fields. 999 x1 := UnexpT{map[int]int{1: 2}} 1000 x2 := UnexpT{map[int]int{1: 2}} 1001 if !DeepEqual(&x1, &x2) { 1002 t.Error("DeepEqual(x1, x2) = false, want true") 1003 } 1004 1005 y1 := UnexpT{map[int]int{2: 3}} 1006 if DeepEqual(&x1, &y1) { 1007 t.Error("DeepEqual(x1, y1) = true, want false") 1008 } 1009 } 1010 1011 func check2ndField(x interface{}, offs uintptr, t *testing.T) { 1012 s := ValueOf(x) 1013 f := s.Type().Field(1) 1014 if f.Offset != offs { 1015 t.Error("mismatched offsets in structure alignment:", f.Offset, offs) 1016 } 1017 } 1018 1019 // Check that structure alignment & offsets viewed through reflect agree with those 1020 // from the compiler itself. 1021 func TestAlignment(t *testing.T) { 1022 type T1inner struct { 1023 a int 1024 } 1025 type T1 struct { 1026 T1inner 1027 f int 1028 } 1029 type T2inner struct { 1030 a, b int 1031 } 1032 type T2 struct { 1033 T2inner 1034 f int 1035 } 1036 1037 x := T1{T1inner{2}, 17} 1038 check2ndField(x, uintptr(unsafe.Pointer(&x.f))-uintptr(unsafe.Pointer(&x)), t) 1039 1040 x1 := T2{T2inner{2, 3}, 17} 1041 check2ndField(x1, uintptr(unsafe.Pointer(&x1.f))-uintptr(unsafe.Pointer(&x1)), t) 1042 } 1043 1044 func Nil(a interface{}, t *testing.T) { 1045 n := ValueOf(a).Field(0) 1046 if !n.IsNil() { 1047 t.Errorf("%v should be nil", a) 1048 } 1049 } 1050 1051 func NotNil(a interface{}, t *testing.T) { 1052 n := ValueOf(a).Field(0) 1053 if n.IsNil() { 1054 t.Errorf("value of type %v should not be nil", ValueOf(a).Type().String()) 1055 } 1056 } 1057 1058 func TestIsNil(t *testing.T) { 1059 // These implement IsNil. 1060 // Wrap in extra struct to hide interface type. 1061 doNil := []interface{}{ 1062 struct{ x *int }{}, 1063 struct{ x interface{} }{}, 1064 struct{ x map[string]int }{}, 1065 struct{ x func() bool }{}, 1066 struct{ x chan int }{}, 1067 struct{ x []string }{}, 1068 struct{ x unsafe.Pointer }{}, 1069 } 1070 for _, ts := range doNil { 1071 ty := TypeOf(ts).Field(0).Type 1072 v := Zero(ty) 1073 v.IsNil() // panics if not okay to call 1074 } 1075 1076 // Check the implementations 1077 var pi struct { 1078 x *int 1079 } 1080 Nil(pi, t) 1081 pi.x = new(int) 1082 NotNil(pi, t) 1083 1084 var si struct { 1085 x []int 1086 } 1087 Nil(si, t) 1088 si.x = make([]int, 10) 1089 NotNil(si, t) 1090 1091 var ci struct { 1092 x chan int 1093 } 1094 Nil(ci, t) 1095 ci.x = make(chan int) 1096 NotNil(ci, t) 1097 1098 var mi struct { 1099 x map[int]int 1100 } 1101 Nil(mi, t) 1102 mi.x = make(map[int]int) 1103 NotNil(mi, t) 1104 1105 var ii struct { 1106 x interface{} 1107 } 1108 Nil(ii, t) 1109 ii.x = 2 1110 NotNil(ii, t) 1111 1112 var fi struct { 1113 x func(t *testing.T) 1114 } 1115 Nil(fi, t) 1116 fi.x = TestIsNil 1117 NotNil(fi, t) 1118 } 1119 1120 func TestIsZero(t *testing.T) { 1121 for i, tt := range []struct { 1122 x interface{} 1123 want bool 1124 }{ 1125 // Booleans 1126 {true, false}, 1127 {false, true}, 1128 // Numeric types 1129 {int(0), true}, 1130 {int(1), false}, 1131 {int8(0), true}, 1132 {int8(1), false}, 1133 {int16(0), true}, 1134 {int16(1), false}, 1135 {int32(0), true}, 1136 {int32(1), false}, 1137 {int64(0), true}, 1138 {int64(1), false}, 1139 {uint(0), true}, 1140 {uint(1), false}, 1141 {uint8(0), true}, 1142 {uint8(1), false}, 1143 {uint16(0), true}, 1144 {uint16(1), false}, 1145 {uint32(0), true}, 1146 {uint32(1), false}, 1147 {uint64(0), true}, 1148 {uint64(1), false}, 1149 {float32(0), true}, 1150 {float32(1.2), false}, 1151 {float64(0), true}, 1152 {float64(1.2), false}, 1153 {math.Copysign(0, -1), false}, 1154 {complex64(0), true}, 1155 {complex64(1.2), false}, 1156 {complex128(0), true}, 1157 {complex128(1.2), false}, 1158 {complex(math.Copysign(0, -1), 0), false}, 1159 {complex(0, math.Copysign(0, -1)), false}, 1160 {complex(math.Copysign(0, -1), math.Copysign(0, -1)), false}, 1161 {uintptr(0), true}, 1162 {uintptr(128), false}, 1163 // Array 1164 {Zero(TypeOf([5]string{})).Interface(), true}, 1165 {[5]string{"", "", "", "", ""}, true}, 1166 {[5]string{}, true}, 1167 {[5]string{"", "", "", "a", ""}, false}, 1168 // Chan 1169 {(chan string)(nil), true}, 1170 {make(chan string), false}, 1171 {time.After(1), false}, 1172 // Func 1173 {(func())(nil), true}, 1174 {New, false}, 1175 // Interface 1176 {New(TypeOf(new(error)).Elem()).Elem(), true}, 1177 {(io.Reader)(strings.NewReader("")), false}, 1178 // Map 1179 {(map[string]string)(nil), true}, 1180 {map[string]string{}, false}, 1181 {make(map[string]string), false}, 1182 // Ptr 1183 {(*func())(nil), true}, 1184 {(*int)(nil), true}, 1185 {new(int), false}, 1186 // Slice 1187 {[]string{}, false}, 1188 {([]string)(nil), true}, 1189 {make([]string, 0), false}, 1190 // Strings 1191 {"", true}, 1192 {"not-zero", false}, 1193 // Structs 1194 {T{}, true}, 1195 {T{123, 456.75, "hello", &_i}, false}, 1196 // UnsafePointer 1197 {(unsafe.Pointer)(nil), true}, 1198 {(unsafe.Pointer)(new(int)), false}, 1199 } { 1200 var x Value 1201 if v, ok := tt.x.(Value); ok { 1202 x = v 1203 } else { 1204 x = ValueOf(tt.x) 1205 } 1206 1207 b := x.IsZero() 1208 if b != tt.want { 1209 t.Errorf("%d: IsZero((%s)(%+v)) = %t, want %t", i, x.Kind(), tt.x, b, tt.want) 1210 } 1211 1212 if !Zero(TypeOf(tt.x)).IsZero() { 1213 t.Errorf("%d: IsZero(Zero(TypeOf((%s)(%+v)))) is false", i, x.Kind(), tt.x) 1214 } 1215 } 1216 1217 func() { 1218 defer func() { 1219 if r := recover(); r == nil { 1220 t.Error("should panic for invalid value") 1221 } 1222 }() 1223 (Value{}).IsZero() 1224 }() 1225 } 1226 1227 func TestInterfaceExtraction(t *testing.T) { 1228 var s struct { 1229 W io.Writer 1230 } 1231 1232 s.W = os.Stdout 1233 v := Indirect(ValueOf(&s)).Field(0).Interface() 1234 if v != s.W.(interface{}) { 1235 t.Error("Interface() on interface: ", v, s.W) 1236 } 1237 } 1238 1239 func TestNilPtrValueSub(t *testing.T) { 1240 var pi *int 1241 if pv := ValueOf(pi); pv.Elem().IsValid() { 1242 t.Error("ValueOf((*int)(nil)).Elem().IsValid()") 1243 } 1244 } 1245 1246 func TestMap(t *testing.T) { 1247 m := map[string]int{"a": 1, "b": 2} 1248 mv := ValueOf(m) 1249 if n := mv.Len(); n != len(m) { 1250 t.Errorf("Len = %d, want %d", n, len(m)) 1251 } 1252 keys := mv.MapKeys() 1253 newmap := MakeMap(mv.Type()) 1254 for k, v := range m { 1255 // Check that returned Keys match keys in range. 1256 // These aren't required to be in the same order. 1257 seen := false 1258 for _, kv := range keys { 1259 if kv.String() == k { 1260 seen = true 1261 break 1262 } 1263 } 1264 if !seen { 1265 t.Errorf("Missing key %q", k) 1266 } 1267 1268 // Check that value lookup is correct. 1269 vv := mv.MapIndex(ValueOf(k)) 1270 if vi := vv.Int(); vi != int64(v) { 1271 t.Errorf("Key %q: have value %d, want %d", k, vi, v) 1272 } 1273 1274 // Copy into new map. 1275 newmap.SetMapIndex(ValueOf(k), ValueOf(v)) 1276 } 1277 vv := mv.MapIndex(ValueOf("not-present")) 1278 if vv.IsValid() { 1279 t.Errorf("Invalid key: got non-nil value %s", valueToString(vv)) 1280 } 1281 1282 newm := newmap.Interface().(map[string]int) 1283 if len(newm) != len(m) { 1284 t.Errorf("length after copy: newm=%d, m=%d", len(newm), len(m)) 1285 } 1286 1287 for k, v := range newm { 1288 mv, ok := m[k] 1289 if mv != v { 1290 t.Errorf("newm[%q] = %d, but m[%q] = %d, %v", k, v, k, mv, ok) 1291 } 1292 } 1293 1294 newmap.SetMapIndex(ValueOf("a"), Value{}) 1295 v, ok := newm["a"] 1296 if ok { 1297 t.Errorf("newm[\"a\"] = %d after delete", v) 1298 } 1299 1300 mv = ValueOf(&m).Elem() 1301 mv.Set(Zero(mv.Type())) 1302 if m != nil { 1303 t.Errorf("mv.Set(nil) failed") 1304 } 1305 } 1306 1307 func TestNilMap(t *testing.T) { 1308 var m map[string]int 1309 mv := ValueOf(m) 1310 keys := mv.MapKeys() 1311 if len(keys) != 0 { 1312 t.Errorf(">0 keys for nil map: %v", keys) 1313 } 1314 1315 // Check that value for missing key is zero. 1316 x := mv.MapIndex(ValueOf("hello")) 1317 if x.Kind() != Invalid { 1318 t.Errorf("m.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x) 1319 } 1320 1321 // Check big value too. 1322 var mbig map[string][10 << 20]byte 1323 x = ValueOf(mbig).MapIndex(ValueOf("hello")) 1324 if x.Kind() != Invalid { 1325 t.Errorf("mbig.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x) 1326 } 1327 1328 // Test that deletes from a nil map succeed. 1329 mv.SetMapIndex(ValueOf("hi"), Value{}) 1330 } 1331 1332 func TestChan(t *testing.T) { 1333 for loop := 0; loop < 2; loop++ { 1334 var c chan int 1335 var cv Value 1336 1337 // check both ways to allocate channels 1338 switch loop { 1339 case 1: 1340 c = make(chan int, 1) 1341 cv = ValueOf(c) 1342 case 0: 1343 cv = MakeChan(TypeOf(c), 1) 1344 c = cv.Interface().(chan int) 1345 } 1346 1347 // Send 1348 cv.Send(ValueOf(2)) 1349 if i := <-c; i != 2 { 1350 t.Errorf("reflect Send 2, native recv %d", i) 1351 } 1352 1353 // Recv 1354 c <- 3 1355 if i, ok := cv.Recv(); i.Int() != 3 || !ok { 1356 t.Errorf("native send 3, reflect Recv %d, %t", i.Int(), ok) 1357 } 1358 1359 // TryRecv fail 1360 val, ok := cv.TryRecv() 1361 if val.IsValid() || ok { 1362 t.Errorf("TryRecv on empty chan: %s, %t", valueToString(val), ok) 1363 } 1364 1365 // TryRecv success 1366 c <- 4 1367 val, ok = cv.TryRecv() 1368 if !val.IsValid() { 1369 t.Errorf("TryRecv on ready chan got nil") 1370 } else if i := val.Int(); i != 4 || !ok { 1371 t.Errorf("native send 4, TryRecv %d, %t", i, ok) 1372 } 1373 1374 // TrySend fail 1375 c <- 100 1376 ok = cv.TrySend(ValueOf(5)) 1377 i := <-c 1378 if ok { 1379 t.Errorf("TrySend on full chan succeeded: value %d", i) 1380 } 1381 1382 // TrySend success 1383 ok = cv.TrySend(ValueOf(6)) 1384 if !ok { 1385 t.Errorf("TrySend on empty chan failed") 1386 select { 1387 case x := <-c: 1388 t.Errorf("TrySend failed but it did send %d", x) 1389 default: 1390 } 1391 } else { 1392 if i = <-c; i != 6 { 1393 t.Errorf("TrySend 6, recv %d", i) 1394 } 1395 } 1396 1397 // Close 1398 c <- 123 1399 cv.Close() 1400 if i, ok := cv.Recv(); i.Int() != 123 || !ok { 1401 t.Errorf("send 123 then close; Recv %d, %t", i.Int(), ok) 1402 } 1403 if i, ok := cv.Recv(); i.Int() != 0 || ok { 1404 t.Errorf("after close Recv %d, %t", i.Int(), ok) 1405 } 1406 } 1407 1408 // check creation of unbuffered channel 1409 var c chan int 1410 cv := MakeChan(TypeOf(c), 0) 1411 c = cv.Interface().(chan int) 1412 if cv.TrySend(ValueOf(7)) { 1413 t.Errorf("TrySend on sync chan succeeded") 1414 } 1415 if v, ok := cv.TryRecv(); v.IsValid() || ok { 1416 t.Errorf("TryRecv on sync chan succeeded: isvalid=%v ok=%v", v.IsValid(), ok) 1417 } 1418 1419 // len/cap 1420 cv = MakeChan(TypeOf(c), 10) 1421 c = cv.Interface().(chan int) 1422 for i := 0; i < 3; i++ { 1423 c <- i 1424 } 1425 if l, m := cv.Len(), cv.Cap(); l != len(c) || m != cap(c) { 1426 t.Errorf("Len/Cap = %d/%d want %d/%d", l, m, len(c), cap(c)) 1427 } 1428 } 1429 1430 // caseInfo describes a single case in a select test. 1431 type caseInfo struct { 1432 desc string 1433 canSelect bool 1434 recv Value 1435 closed bool 1436 helper func() 1437 panic bool 1438 } 1439 1440 var allselect = flag.Bool("allselect", false, "exhaustive select test") 1441 1442 func TestSelect(t *testing.T) { 1443 selectWatch.once.Do(func() { go selectWatcher() }) 1444 1445 var x exhaustive 1446 nch := 0 1447 newop := func(n int, cap int) (ch, val Value) { 1448 nch++ 1449 if nch%101%2 == 1 { 1450 c := make(chan int, cap) 1451 ch = ValueOf(c) 1452 val = ValueOf(n) 1453 } else { 1454 c := make(chan string, cap) 1455 ch = ValueOf(c) 1456 val = ValueOf(fmt.Sprint(n)) 1457 } 1458 return 1459 } 1460 1461 for n := 0; x.Next(); n++ { 1462 if testing.Short() && n >= 1000 { 1463 break 1464 } 1465 if n >= 100000 && !*allselect { 1466 break 1467 } 1468 if n%100000 == 0 && testing.Verbose() { 1469 println("TestSelect", n) 1470 } 1471 var cases []SelectCase 1472 var info []caseInfo 1473 1474 // Ready send. 1475 if x.Maybe() { 1476 ch, val := newop(len(cases), 1) 1477 cases = append(cases, SelectCase{ 1478 Dir: SelectSend, 1479 Chan: ch, 1480 Send: val, 1481 }) 1482 info = append(info, caseInfo{desc: "ready send", canSelect: true}) 1483 } 1484 1485 // Ready recv. 1486 if x.Maybe() { 1487 ch, val := newop(len(cases), 1) 1488 ch.Send(val) 1489 cases = append(cases, SelectCase{ 1490 Dir: SelectRecv, 1491 Chan: ch, 1492 }) 1493 info = append(info, caseInfo{desc: "ready recv", canSelect: true, recv: val}) 1494 } 1495 1496 // Blocking send. 1497 if x.Maybe() { 1498 ch, val := newop(len(cases), 0) 1499 cases = append(cases, SelectCase{ 1500 Dir: SelectSend, 1501 Chan: ch, 1502 Send: val, 1503 }) 1504 // Let it execute? 1505 if x.Maybe() { 1506 f := func() { ch.Recv() } 1507 info = append(info, caseInfo{desc: "blocking send", helper: f}) 1508 } else { 1509 info = append(info, caseInfo{desc: "blocking send"}) 1510 } 1511 } 1512 1513 // Blocking recv. 1514 if x.Maybe() { 1515 ch, val := newop(len(cases), 0) 1516 cases = append(cases, SelectCase{ 1517 Dir: SelectRecv, 1518 Chan: ch, 1519 }) 1520 // Let it execute? 1521 if x.Maybe() { 1522 f := func() { ch.Send(val) } 1523 info = append(info, caseInfo{desc: "blocking recv", recv: val, helper: f}) 1524 } else { 1525 info = append(info, caseInfo{desc: "blocking recv"}) 1526 } 1527 } 1528 1529 // Zero Chan send. 1530 if x.Maybe() { 1531 // Maybe include value to send. 1532 var val Value 1533 if x.Maybe() { 1534 val = ValueOf(100) 1535 } 1536 cases = append(cases, SelectCase{ 1537 Dir: SelectSend, 1538 Send: val, 1539 }) 1540 info = append(info, caseInfo{desc: "zero Chan send"}) 1541 } 1542 1543 // Zero Chan receive. 1544 if x.Maybe() { 1545 cases = append(cases, SelectCase{ 1546 Dir: SelectRecv, 1547 }) 1548 info = append(info, caseInfo{desc: "zero Chan recv"}) 1549 } 1550 1551 // nil Chan send. 1552 if x.Maybe() { 1553 cases = append(cases, SelectCase{ 1554 Dir: SelectSend, 1555 Chan: ValueOf((chan int)(nil)), 1556 Send: ValueOf(101), 1557 }) 1558 info = append(info, caseInfo{desc: "nil Chan send"}) 1559 } 1560 1561 // nil Chan recv. 1562 if x.Maybe() { 1563 cases = append(cases, SelectCase{ 1564 Dir: SelectRecv, 1565 Chan: ValueOf((chan int)(nil)), 1566 }) 1567 info = append(info, caseInfo{desc: "nil Chan recv"}) 1568 } 1569 1570 // closed Chan send. 1571 if x.Maybe() { 1572 ch := make(chan int) 1573 close(ch) 1574 cases = append(cases, SelectCase{ 1575 Dir: SelectSend, 1576 Chan: ValueOf(ch), 1577 Send: ValueOf(101), 1578 }) 1579 info = append(info, caseInfo{desc: "closed Chan send", canSelect: true, panic: true}) 1580 } 1581 1582 // closed Chan recv. 1583 if x.Maybe() { 1584 ch, val := newop(len(cases), 0) 1585 ch.Close() 1586 val = Zero(val.Type()) 1587 cases = append(cases, SelectCase{ 1588 Dir: SelectRecv, 1589 Chan: ch, 1590 }) 1591 info = append(info, caseInfo{desc: "closed Chan recv", canSelect: true, closed: true, recv: val}) 1592 } 1593 1594 var helper func() // goroutine to help the select complete 1595 1596 // Add default? Must be last case here, but will permute. 1597 // Add the default if the select would otherwise 1598 // block forever, and maybe add it anyway. 1599 numCanSelect := 0 1600 canProceed := false 1601 canBlock := true 1602 canPanic := false 1603 helpers := []int{} 1604 for i, c := range info { 1605 if c.canSelect { 1606 canProceed = true 1607 canBlock = false 1608 numCanSelect++ 1609 if c.panic { 1610 canPanic = true 1611 } 1612 } else if c.helper != nil { 1613 canProceed = true 1614 helpers = append(helpers, i) 1615 } 1616 } 1617 if !canProceed || x.Maybe() { 1618 cases = append(cases, SelectCase{ 1619 Dir: SelectDefault, 1620 }) 1621 info = append(info, caseInfo{desc: "default", canSelect: canBlock}) 1622 numCanSelect++ 1623 } else if canBlock { 1624 // Select needs to communicate with another goroutine. 1625 cas := &info[helpers[x.Choose(len(helpers))]] 1626 helper = cas.helper 1627 cas.canSelect = true 1628 numCanSelect++ 1629 } 1630 1631 // Permute cases and case info. 1632 // Doing too much here makes the exhaustive loop 1633 // too exhausting, so just do two swaps. 1634 for loop := 0; loop < 2; loop++ { 1635 i := x.Choose(len(cases)) 1636 j := x.Choose(len(cases)) 1637 cases[i], cases[j] = cases[j], cases[i] 1638 info[i], info[j] = info[j], info[i] 1639 } 1640 1641 if helper != nil { 1642 // We wait before kicking off a goroutine to satisfy a blocked select. 1643 // The pause needs to be big enough to let the select block before 1644 // we run the helper, but if we lose that race once in a while it's okay: the 1645 // select will just proceed immediately. Not a big deal. 1646 // For short tests we can grow [sic] the timeout a bit without fear of taking too long 1647 pause := 10 * time.Microsecond 1648 if testing.Short() { 1649 pause = 100 * time.Microsecond 1650 } 1651 time.AfterFunc(pause, helper) 1652 } 1653 1654 // Run select. 1655 i, recv, recvOK, panicErr := runSelect(cases, info) 1656 if panicErr != nil && !canPanic { 1657 t.Fatalf("%s\npanicked unexpectedly: %v", fmtSelect(info), panicErr) 1658 } 1659 if panicErr == nil && canPanic && numCanSelect == 1 { 1660 t.Fatalf("%s\nselected #%d incorrectly (should panic)", fmtSelect(info), i) 1661 } 1662 if panicErr != nil { 1663 continue 1664 } 1665 1666 cas := info[i] 1667 if !cas.canSelect { 1668 recvStr := "" 1669 if recv.IsValid() { 1670 recvStr = fmt.Sprintf(", received %v, %v", recv.Interface(), recvOK) 1671 } 1672 t.Fatalf("%s\nselected #%d incorrectly%s", fmtSelect(info), i, recvStr) 1673 continue 1674 } 1675 if cas.panic { 1676 t.Fatalf("%s\nselected #%d incorrectly (case should panic)", fmtSelect(info), i) 1677 continue 1678 } 1679 1680 if cases[i].Dir == SelectRecv { 1681 if !recv.IsValid() { 1682 t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, cas.recv.Interface(), !cas.closed) 1683 } 1684 if !cas.recv.IsValid() { 1685 t.Fatalf("%s\nselected #%d but internal error: missing recv value", fmtSelect(info), i) 1686 } 1687 if recv.Interface() != cas.recv.Interface() || recvOK != !cas.closed { 1688 if recv.Interface() == cas.recv.Interface() && recvOK == !cas.closed { 1689 t.Fatalf("%s\nselected #%d, got %#v, %v, and DeepEqual is broken on %T", fmtSelect(info), i, recv.Interface(), recvOK, recv.Interface()) 1690 } 1691 t.Fatalf("%s\nselected #%d but got %#v, %v, want %#v, %v", fmtSelect(info), i, recv.Interface(), recvOK, cas.recv.Interface(), !cas.closed) 1692 } 1693 } else { 1694 if recv.IsValid() || recvOK { 1695 t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, Value{}, false) 1696 } 1697 } 1698 } 1699 } 1700 1701 func TestSelectMaxCases(t *testing.T) { 1702 var sCases []SelectCase 1703 channel := make(chan int) 1704 close(channel) 1705 for i := 0; i < 65536; i++ { 1706 sCases = append(sCases, SelectCase{ 1707 Dir: SelectRecv, 1708 Chan: ValueOf(channel), 1709 }) 1710 } 1711 // Should not panic 1712 _, _, _ = Select(sCases) 1713 sCases = append(sCases, SelectCase{ 1714 Dir: SelectRecv, 1715 Chan: ValueOf(channel), 1716 }) 1717 defer func() { 1718 if err := recover(); err != nil { 1719 if err.(string) != "reflect.Select: too many cases (max 65536)" { 1720 t.Fatalf("unexpected error from select call with greater than max supported cases") 1721 } 1722 } else { 1723 t.Fatalf("expected select call to panic with greater than max supported cases") 1724 } 1725 }() 1726 // Should panic 1727 _, _, _ = Select(sCases) 1728 } 1729 1730 func TestSelectNop(t *testing.T) { 1731 // "select { default: }" should always return the default case. 1732 chosen, _, _ := Select([]SelectCase{{Dir: SelectDefault}}) 1733 if chosen != 0 { 1734 t.Fatalf("expected Select to return 0, but got %#v", chosen) 1735 } 1736 } 1737 1738 func BenchmarkSelect(b *testing.B) { 1739 channel := make(chan int) 1740 close(channel) 1741 var cases []SelectCase 1742 for i := 0; i < 8; i++ { 1743 cases = append(cases, SelectCase{ 1744 Dir: SelectRecv, 1745 Chan: ValueOf(channel), 1746 }) 1747 } 1748 for _, numCases := range []int{1, 4, 8} { 1749 b.Run(strconv.Itoa(numCases), func(b *testing.B) { 1750 b.ReportAllocs() 1751 for i := 0; i < b.N; i++ { 1752 _, _, _ = Select(cases[:numCases]) 1753 } 1754 }) 1755 } 1756 } 1757 1758 // selectWatch and the selectWatcher are a watchdog mechanism for running Select. 1759 // If the selectWatcher notices that the select has been blocked for >1 second, it prints 1760 // an error describing the select and panics the entire test binary. 1761 var selectWatch struct { 1762 sync.Mutex 1763 once sync.Once 1764 now time.Time 1765 info []caseInfo 1766 } 1767 1768 func selectWatcher() { 1769 for { 1770 time.Sleep(1 * time.Second) 1771 selectWatch.Lock() 1772 if selectWatch.info != nil && time.Since(selectWatch.now) > 10*time.Second { 1773 fmt.Fprintf(os.Stderr, "TestSelect:\n%s blocked indefinitely\n", fmtSelect(selectWatch.info)) 1774 panic("select stuck") 1775 } 1776 selectWatch.Unlock() 1777 } 1778 } 1779 1780 // runSelect runs a single select test. 1781 // It returns the values returned by Select but also returns 1782 // a panic value if the Select panics. 1783 func runSelect(cases []SelectCase, info []caseInfo) (chosen int, recv Value, recvOK bool, panicErr interface{}) { 1784 defer func() { 1785 panicErr = recover() 1786 1787 selectWatch.Lock() 1788 selectWatch.info = nil 1789 selectWatch.Unlock() 1790 }() 1791 1792 selectWatch.Lock() 1793 selectWatch.now = time.Now() 1794 selectWatch.info = info 1795 selectWatch.Unlock() 1796 1797 chosen, recv, recvOK = Select(cases) 1798 return 1799 } 1800 1801 // fmtSelect formats the information about a single select test. 1802 func fmtSelect(info []caseInfo) string { 1803 var buf bytes.Buffer 1804 fmt.Fprintf(&buf, "\nselect {\n") 1805 for i, cas := range info { 1806 fmt.Fprintf(&buf, "%d: %s", i, cas.desc) 1807 if cas.recv.IsValid() { 1808 fmt.Fprintf(&buf, " val=%#v", cas.recv.Interface()) 1809 } 1810 if cas.canSelect { 1811 fmt.Fprintf(&buf, " canselect") 1812 } 1813 if cas.panic { 1814 fmt.Fprintf(&buf, " panic") 1815 } 1816 fmt.Fprintf(&buf, "\n") 1817 } 1818 fmt.Fprintf(&buf, "}") 1819 return buf.String() 1820 } 1821 1822 type two [2]uintptr 1823 1824 // Difficult test for function call because of 1825 // implicit padding between arguments. 1826 func dummy(b byte, c int, d byte, e two, f byte, g float32, h byte) (i byte, j int, k byte, l two, m byte, n float32, o byte) { 1827 return b, c, d, e, f, g, h 1828 } 1829 1830 func TestFunc(t *testing.T) { 1831 ret := ValueOf(dummy).Call([]Value{ 1832 ValueOf(byte(10)), 1833 ValueOf(20), 1834 ValueOf(byte(30)), 1835 ValueOf(two{40, 50}), 1836 ValueOf(byte(60)), 1837 ValueOf(float32(70)), 1838 ValueOf(byte(80)), 1839 }) 1840 if len(ret) != 7 { 1841 t.Fatalf("Call returned %d values, want 7", len(ret)) 1842 } 1843 1844 i := byte(ret[0].Uint()) 1845 j := int(ret[1].Int()) 1846 k := byte(ret[2].Uint()) 1847 l := ret[3].Interface().(two) 1848 m := byte(ret[4].Uint()) 1849 n := float32(ret[5].Float()) 1850 o := byte(ret[6].Uint()) 1851 1852 if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 { 1853 t.Errorf("Call returned %d, %d, %d, %v, %d, %g, %d; want 10, 20, 30, [40, 50], 60, 70, 80", i, j, k, l, m, n, o) 1854 } 1855 1856 for i, v := range ret { 1857 if v.CanAddr() { 1858 t.Errorf("result %d is addressable", i) 1859 } 1860 } 1861 } 1862 1863 func TestCallConvert(t *testing.T) { 1864 v := ValueOf(new(io.ReadWriter)).Elem() 1865 f := ValueOf(func(r io.Reader) io.Reader { return r }) 1866 out := f.Call([]Value{v}) 1867 if len(out) != 1 || out[0].Type() != TypeOf(new(io.Reader)).Elem() || !out[0].IsNil() { 1868 t.Errorf("expected [nil], got %v", out) 1869 } 1870 } 1871 1872 type emptyStruct struct{} 1873 1874 type nonEmptyStruct struct { 1875 member int 1876 } 1877 1878 func returnEmpty() emptyStruct { 1879 return emptyStruct{} 1880 } 1881 1882 func takesEmpty(e emptyStruct) { 1883 } 1884 1885 func returnNonEmpty(i int) nonEmptyStruct { 1886 return nonEmptyStruct{member: i} 1887 } 1888 1889 func takesNonEmpty(n nonEmptyStruct) int { 1890 return n.member 1891 } 1892 1893 func TestCallWithStruct(t *testing.T) { 1894 r := ValueOf(returnEmpty).Call(nil) 1895 if len(r) != 1 || r[0].Type() != TypeOf(emptyStruct{}) { 1896 t.Errorf("returning empty struct returned %#v instead", r) 1897 } 1898 r = ValueOf(takesEmpty).Call([]Value{ValueOf(emptyStruct{})}) 1899 if len(r) != 0 { 1900 t.Errorf("takesEmpty returned values: %#v", r) 1901 } 1902 r = ValueOf(returnNonEmpty).Call([]Value{ValueOf(42)}) 1903 if len(r) != 1 || r[0].Type() != TypeOf(nonEmptyStruct{}) || r[0].Field(0).Int() != 42 { 1904 t.Errorf("returnNonEmpty returned %#v", r) 1905 } 1906 r = ValueOf(takesNonEmpty).Call([]Value{ValueOf(nonEmptyStruct{member: 42})}) 1907 if len(r) != 1 || r[0].Type() != TypeOf(1) || r[0].Int() != 42 { 1908 t.Errorf("takesNonEmpty returned %#v", r) 1909 } 1910 } 1911 1912 func TestCallReturnsEmpty(t *testing.T) { 1913 // Issue 21717: past-the-end pointer write in Call with 1914 // nonzero-sized frame and zero-sized return value. 1915 runtime.GC() 1916 var finalized uint32 1917 f := func() (emptyStruct, *[2]int64) { 1918 i := new([2]int64) // big enough to not be tinyalloc'd, so finalizer always runs when i dies 1919 runtime.SetFinalizer(i, func(*[2]int64) { atomic.StoreUint32(&finalized, 1) }) 1920 return emptyStruct{}, i 1921 } 1922 v := ValueOf(f).Call(nil)[0] // out[0] should not alias out[1]'s memory, so the finalizer should run. 1923 timeout := time.After(5 * time.Second) 1924 for atomic.LoadUint32(&finalized) == 0 { 1925 select { 1926 case <-timeout: 1927 t.Fatal("finalizer did not run") 1928 default: 1929 } 1930 runtime.Gosched() 1931 runtime.GC() 1932 } 1933 runtime.KeepAlive(v) 1934 } 1935 1936 func BenchmarkCall(b *testing.B) { 1937 fv := ValueOf(func(a, b string) {}) 1938 b.ReportAllocs() 1939 b.RunParallel(func(pb *testing.PB) { 1940 args := []Value{ValueOf("a"), ValueOf("b")} 1941 for pb.Next() { 1942 fv.Call(args) 1943 } 1944 }) 1945 } 1946 1947 type myint int64 1948 1949 func (i *myint) inc() { 1950 *i = *i + 1 1951 } 1952 1953 func BenchmarkCallMethod(b *testing.B) { 1954 b.ReportAllocs() 1955 z := new(myint) 1956 1957 v := ValueOf(z.inc) 1958 for i := 0; i < b.N; i++ { 1959 v.Call(nil) 1960 } 1961 } 1962 1963 func BenchmarkCallArgCopy(b *testing.B) { 1964 byteArray := func(n int) Value { 1965 return Zero(ArrayOf(n, TypeOf(byte(0)))) 1966 } 1967 sizes := [...]struct { 1968 fv Value 1969 arg Value 1970 }{ 1971 {ValueOf(func(a [128]byte) {}), byteArray(128)}, 1972 {ValueOf(func(a [256]byte) {}), byteArray(256)}, 1973 {ValueOf(func(a [1024]byte) {}), byteArray(1024)}, 1974 {ValueOf(func(a [4096]byte) {}), byteArray(4096)}, 1975 {ValueOf(func(a [65536]byte) {}), byteArray(65536)}, 1976 } 1977 for _, size := range sizes { 1978 bench := func(b *testing.B) { 1979 args := []Value{size.arg} 1980 b.SetBytes(int64(size.arg.Len())) 1981 b.ResetTimer() 1982 b.RunParallel(func(pb *testing.PB) { 1983 for pb.Next() { 1984 size.fv.Call(args) 1985 } 1986 }) 1987 } 1988 name := fmt.Sprintf("size=%v", size.arg.Len()) 1989 b.Run(name, bench) 1990 } 1991 } 1992 1993 func TestMakeFunc(t *testing.T) { 1994 f := dummy 1995 fv := MakeFunc(TypeOf(f), func(in []Value) []Value { return in }) 1996 ValueOf(&f).Elem().Set(fv) 1997 1998 // Call g with small arguments so that there is 1999 // something predictable (and different from the 2000 // correct results) in those positions on the stack. 2001 g := dummy 2002 g(1, 2, 3, two{4, 5}, 6, 7, 8) 2003 2004 // Call constructed function f. 2005 i, j, k, l, m, n, o := f(10, 20, 30, two{40, 50}, 60, 70, 80) 2006 if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 { 2007 t.Errorf("Call returned %d, %d, %d, %v, %d, %g, %d; want 10, 20, 30, [40, 50], 60, 70, 80", i, j, k, l, m, n, o) 2008 } 2009 } 2010 2011 func TestMakeFuncInterface(t *testing.T) { 2012 fn := func(i int) int { return i } 2013 incr := func(in []Value) []Value { 2014 return []Value{ValueOf(int(in[0].Int() + 1))} 2015 } 2016 fv := MakeFunc(TypeOf(fn), incr) 2017 ValueOf(&fn).Elem().Set(fv) 2018 if r := fn(2); r != 3 { 2019 t.Errorf("Call returned %d, want 3", r) 2020 } 2021 if r := fv.Call([]Value{ValueOf(14)})[0].Int(); r != 15 { 2022 t.Errorf("Call returned %d, want 15", r) 2023 } 2024 if r := fv.Interface().(func(int) int)(26); r != 27 { 2025 t.Errorf("Call returned %d, want 27", r) 2026 } 2027 } 2028 2029 func TestMakeFuncVariadic(t *testing.T) { 2030 // Test that variadic arguments are packed into a slice and passed as last arg 2031 fn := func(_ int, is ...int) []int { return nil } 2032 fv := MakeFunc(TypeOf(fn), func(in []Value) []Value { return in[1:2] }) 2033 ValueOf(&fn).Elem().Set(fv) 2034 2035 r := fn(1, 2, 3) 2036 if r[0] != 2 || r[1] != 3 { 2037 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2038 } 2039 2040 r = fn(1, []int{2, 3}...) 2041 if r[0] != 2 || r[1] != 3 { 2042 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2043 } 2044 2045 r = fv.Call([]Value{ValueOf(1), ValueOf(2), ValueOf(3)})[0].Interface().([]int) 2046 if r[0] != 2 || r[1] != 3 { 2047 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2048 } 2049 2050 r = fv.CallSlice([]Value{ValueOf(1), ValueOf([]int{2, 3})})[0].Interface().([]int) 2051 if r[0] != 2 || r[1] != 3 { 2052 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2053 } 2054 2055 f := fv.Interface().(func(int, ...int) []int) 2056 2057 r = f(1, 2, 3) 2058 if r[0] != 2 || r[1] != 3 { 2059 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2060 } 2061 r = f(1, []int{2, 3}...) 2062 if r[0] != 2 || r[1] != 3 { 2063 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2064 } 2065 } 2066 2067 // Dummy type that implements io.WriteCloser 2068 type WC struct { 2069 } 2070 2071 func (w *WC) Write(p []byte) (n int, err error) { 2072 return 0, nil 2073 } 2074 func (w *WC) Close() error { 2075 return nil 2076 } 2077 2078 func TestMakeFuncValidReturnAssignments(t *testing.T) { 2079 // reflect.Values returned from the wrapped function should be assignment-converted 2080 // to the types returned by the result of MakeFunc. 2081 2082 // Concrete types should be promotable to interfaces they implement. 2083 var f func() error 2084 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2085 return []Value{ValueOf(io.EOF)} 2086 }).Interface().(func() error) 2087 f() 2088 2089 // Super-interfaces should be promotable to simpler interfaces. 2090 var g func() io.Writer 2091 g = MakeFunc(TypeOf(g), func([]Value) []Value { 2092 var w io.WriteCloser = &WC{} 2093 return []Value{ValueOf(&w).Elem()} 2094 }).Interface().(func() io.Writer) 2095 g() 2096 2097 // Channels should be promotable to directional channels. 2098 var h func() <-chan int 2099 h = MakeFunc(TypeOf(h), func([]Value) []Value { 2100 return []Value{ValueOf(make(chan int))} 2101 }).Interface().(func() <-chan int) 2102 h() 2103 2104 // Unnamed types should be promotable to named types. 2105 type T struct{ a, b, c int } 2106 var i func() T 2107 i = MakeFunc(TypeOf(i), func([]Value) []Value { 2108 return []Value{ValueOf(struct{ a, b, c int }{a: 1, b: 2, c: 3})} 2109 }).Interface().(func() T) 2110 i() 2111 } 2112 2113 func TestMakeFuncInvalidReturnAssignments(t *testing.T) { 2114 // Type doesn't implement the required interface. 2115 shouldPanic("", func() { 2116 var f func() error 2117 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2118 return []Value{ValueOf(int(7))} 2119 }).Interface().(func() error) 2120 f() 2121 }) 2122 // Assigning to an interface with additional methods. 2123 shouldPanic("", func() { 2124 var f func() io.ReadWriteCloser 2125 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2126 var w io.WriteCloser = &WC{} 2127 return []Value{ValueOf(&w).Elem()} 2128 }).Interface().(func() io.ReadWriteCloser) 2129 f() 2130 }) 2131 // Directional channels can't be assigned to bidirectional ones. 2132 shouldPanic("", func() { 2133 var f func() chan int 2134 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2135 var c <-chan int = make(chan int) 2136 return []Value{ValueOf(c)} 2137 }).Interface().(func() chan int) 2138 f() 2139 }) 2140 // Two named types which are otherwise identical. 2141 shouldPanic("", func() { 2142 type T struct{ a, b, c int } 2143 type U struct{ a, b, c int } 2144 var f func() T 2145 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2146 return []Value{ValueOf(U{a: 1, b: 2, c: 3})} 2147 }).Interface().(func() T) 2148 f() 2149 }) 2150 } 2151 2152 type Point struct { 2153 x, y int 2154 } 2155 2156 // This will be index 0. 2157 func (p Point) AnotherMethod(scale int) int { 2158 return -1 2159 } 2160 2161 // This will be index 1. 2162 func (p Point) Dist(scale int) int { 2163 //println("Point.Dist", p.x, p.y, scale) 2164 return p.x*p.x*scale + p.y*p.y*scale 2165 } 2166 2167 // This will be index 2. 2168 func (p Point) GCMethod(k int) int { 2169 runtime.GC() 2170 return k + p.x 2171 } 2172 2173 // This will be index 3. 2174 func (p Point) NoArgs() { 2175 // Exercise no-argument/no-result paths. 2176 } 2177 2178 // This will be index 4. 2179 func (p Point) TotalDist(points ...Point) int { 2180 tot := 0 2181 for _, q := range points { 2182 dx := q.x - p.x 2183 dy := q.y - p.y 2184 tot += dx*dx + dy*dy // Should call Sqrt, but it's just a test. 2185 2186 } 2187 return tot 2188 } 2189 2190 // This will be index 5. 2191 func (p *Point) Int64Method(x int64) int64 { 2192 return x 2193 } 2194 2195 // This will be index 6. 2196 func (p *Point) Int32Method(x int32) int32 { 2197 return x 2198 } 2199 2200 func TestMethod(t *testing.T) { 2201 // Non-curried method of type. 2202 p := Point{3, 4} 2203 i := TypeOf(p).Method(1).Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int() 2204 if i != 250 { 2205 t.Errorf("Type Method returned %d; want 250", i) 2206 } 2207 2208 m, ok := TypeOf(p).MethodByName("Dist") 2209 if !ok { 2210 t.Fatalf("method by name failed") 2211 } 2212 i = m.Func.Call([]Value{ValueOf(p), ValueOf(11)})[0].Int() 2213 if i != 275 { 2214 t.Errorf("Type MethodByName returned %d; want 275", i) 2215 } 2216 2217 m, ok = TypeOf(p).MethodByName("NoArgs") 2218 if !ok { 2219 t.Fatalf("method by name failed") 2220 } 2221 n := len(m.Func.Call([]Value{ValueOf(p)})) 2222 if n != 0 { 2223 t.Errorf("NoArgs returned %d values; want 0", n) 2224 } 2225 2226 i = TypeOf(&p).Method(1).Func.Call([]Value{ValueOf(&p), ValueOf(12)})[0].Int() 2227 if i != 300 { 2228 t.Errorf("Pointer Type Method returned %d; want 300", i) 2229 } 2230 2231 m, ok = TypeOf(&p).MethodByName("Dist") 2232 if !ok { 2233 t.Fatalf("ptr method by name failed") 2234 } 2235 i = m.Func.Call([]Value{ValueOf(&p), ValueOf(13)})[0].Int() 2236 if i != 325 { 2237 t.Errorf("Pointer Type MethodByName returned %d; want 325", i) 2238 } 2239 2240 m, ok = TypeOf(&p).MethodByName("NoArgs") 2241 if !ok { 2242 t.Fatalf("method by name failed") 2243 } 2244 n = len(m.Func.Call([]Value{ValueOf(&p)})) 2245 if n != 0 { 2246 t.Errorf("NoArgs returned %d values; want 0", n) 2247 } 2248 2249 // Curried method of value. 2250 tfunc := TypeOf((func(int) int)(nil)) 2251 v := ValueOf(p).Method(1) 2252 if tt := v.Type(); tt != tfunc { 2253 t.Errorf("Value Method Type is %s; want %s", tt, tfunc) 2254 } 2255 i = v.Call([]Value{ValueOf(14)})[0].Int() 2256 if i != 350 { 2257 t.Errorf("Value Method returned %d; want 350", i) 2258 } 2259 v = ValueOf(p).MethodByName("Dist") 2260 if tt := v.Type(); tt != tfunc { 2261 t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc) 2262 } 2263 i = v.Call([]Value{ValueOf(15)})[0].Int() 2264 if i != 375 { 2265 t.Errorf("Value MethodByName returned %d; want 375", i) 2266 } 2267 v = ValueOf(p).MethodByName("NoArgs") 2268 v.Call(nil) 2269 2270 // Curried method of pointer. 2271 v = ValueOf(&p).Method(1) 2272 if tt := v.Type(); tt != tfunc { 2273 t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc) 2274 } 2275 i = v.Call([]Value{ValueOf(16)})[0].Int() 2276 if i != 400 { 2277 t.Errorf("Pointer Value Method returned %d; want 400", i) 2278 } 2279 v = ValueOf(&p).MethodByName("Dist") 2280 if tt := v.Type(); tt != tfunc { 2281 t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc) 2282 } 2283 i = v.Call([]Value{ValueOf(17)})[0].Int() 2284 if i != 425 { 2285 t.Errorf("Pointer Value MethodByName returned %d; want 425", i) 2286 } 2287 v = ValueOf(&p).MethodByName("NoArgs") 2288 v.Call(nil) 2289 2290 // Curried method of interface value. 2291 // Have to wrap interface value in a struct to get at it. 2292 // Passing it to ValueOf directly would 2293 // access the underlying Point, not the interface. 2294 var x interface { 2295 Dist(int) int 2296 } = p 2297 pv := ValueOf(&x).Elem() 2298 v = pv.Method(0) 2299 if tt := v.Type(); tt != tfunc { 2300 t.Errorf("Interface Method Type is %s; want %s", tt, tfunc) 2301 } 2302 i = v.Call([]Value{ValueOf(18)})[0].Int() 2303 if i != 450 { 2304 t.Errorf("Interface Method returned %d; want 450", i) 2305 } 2306 v = pv.MethodByName("Dist") 2307 if tt := v.Type(); tt != tfunc { 2308 t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc) 2309 } 2310 i = v.Call([]Value{ValueOf(19)})[0].Int() 2311 if i != 475 { 2312 t.Errorf("Interface MethodByName returned %d; want 475", i) 2313 } 2314 } 2315 2316 func TestMethodValue(t *testing.T) { 2317 p := Point{3, 4} 2318 var i int64 2319 2320 // Curried method of value. 2321 tfunc := TypeOf((func(int) int)(nil)) 2322 v := ValueOf(p).Method(1) 2323 if tt := v.Type(); tt != tfunc { 2324 t.Errorf("Value Method Type is %s; want %s", tt, tfunc) 2325 } 2326 i = ValueOf(v.Interface()).Call([]Value{ValueOf(10)})[0].Int() 2327 if i != 250 { 2328 t.Errorf("Value Method returned %d; want 250", i) 2329 } 2330 v = ValueOf(p).MethodByName("Dist") 2331 if tt := v.Type(); tt != tfunc { 2332 t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc) 2333 } 2334 i = ValueOf(v.Interface()).Call([]Value{ValueOf(11)})[0].Int() 2335 if i != 275 { 2336 t.Errorf("Value MethodByName returned %d; want 275", i) 2337 } 2338 v = ValueOf(p).MethodByName("NoArgs") 2339 ValueOf(v.Interface()).Call(nil) 2340 v.Interface().(func())() 2341 2342 // Curried method of pointer. 2343 v = ValueOf(&p).Method(1) 2344 if tt := v.Type(); tt != tfunc { 2345 t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc) 2346 } 2347 i = ValueOf(v.Interface()).Call([]Value{ValueOf(12)})[0].Int() 2348 if i != 300 { 2349 t.Errorf("Pointer Value Method returned %d; want 300", i) 2350 } 2351 v = ValueOf(&p).MethodByName("Dist") 2352 if tt := v.Type(); tt != tfunc { 2353 t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc) 2354 } 2355 i = ValueOf(v.Interface()).Call([]Value{ValueOf(13)})[0].Int() 2356 if i != 325 { 2357 t.Errorf("Pointer Value MethodByName returned %d; want 325", i) 2358 } 2359 v = ValueOf(&p).MethodByName("NoArgs") 2360 ValueOf(v.Interface()).Call(nil) 2361 v.Interface().(func())() 2362 2363 // Curried method of pointer to pointer. 2364 pp := &p 2365 v = ValueOf(&pp).Elem().Method(1) 2366 if tt := v.Type(); tt != tfunc { 2367 t.Errorf("Pointer Pointer Value Method Type is %s; want %s", tt, tfunc) 2368 } 2369 i = ValueOf(v.Interface()).Call([]Value{ValueOf(14)})[0].Int() 2370 if i != 350 { 2371 t.Errorf("Pointer Pointer Value Method returned %d; want 350", i) 2372 } 2373 v = ValueOf(&pp).Elem().MethodByName("Dist") 2374 if tt := v.Type(); tt != tfunc { 2375 t.Errorf("Pointer Pointer Value MethodByName Type is %s; want %s", tt, tfunc) 2376 } 2377 i = ValueOf(v.Interface()).Call([]Value{ValueOf(15)})[0].Int() 2378 if i != 375 { 2379 t.Errorf("Pointer Pointer Value MethodByName returned %d; want 375", i) 2380 } 2381 2382 // Curried method of interface value. 2383 // Have to wrap interface value in a struct to get at it. 2384 // Passing it to ValueOf directly would 2385 // access the underlying Point, not the interface. 2386 var s = struct { 2387 X interface { 2388 Dist(int) int 2389 } 2390 }{p} 2391 pv := ValueOf(s).Field(0) 2392 v = pv.Method(0) 2393 if tt := v.Type(); tt != tfunc { 2394 t.Errorf("Interface Method Type is %s; want %s", tt, tfunc) 2395 } 2396 i = ValueOf(v.Interface()).Call([]Value{ValueOf(16)})[0].Int() 2397 if i != 400 { 2398 t.Errorf("Interface Method returned %d; want 400", i) 2399 } 2400 v = pv.MethodByName("Dist") 2401 if tt := v.Type(); tt != tfunc { 2402 t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc) 2403 } 2404 i = ValueOf(v.Interface()).Call([]Value{ValueOf(17)})[0].Int() 2405 if i != 425 { 2406 t.Errorf("Interface MethodByName returned %d; want 425", i) 2407 } 2408 2409 // For issue #33628: method args are not stored at the right offset 2410 // on amd64p32. 2411 m64 := ValueOf(&p).MethodByName("Int64Method").Interface().(func(int64) int64) 2412 if x := m64(123); x != 123 { 2413 t.Errorf("Int64Method returned %d; want 123", x) 2414 } 2415 m32 := ValueOf(&p).MethodByName("Int32Method").Interface().(func(int32) int32) 2416 if x := m32(456); x != 456 { 2417 t.Errorf("Int32Method returned %d; want 456", x) 2418 } 2419 } 2420 2421 func TestVariadicMethodValue(t *testing.T) { 2422 p := Point{3, 4} 2423 points := []Point{{20, 21}, {22, 23}, {24, 25}} 2424 want := int64(p.TotalDist(points[0], points[1], points[2])) 2425 2426 // Variadic method of type. 2427 tfunc := TypeOf((func(Point, ...Point) int)(nil)) 2428 if tt := TypeOf(p).Method(4).Type; tt != tfunc { 2429 t.Errorf("Variadic Method Type from TypeOf is %s; want %s", tt, tfunc) 2430 } 2431 2432 // Curried method of value. 2433 tfunc = TypeOf((func(...Point) int)(nil)) 2434 v := ValueOf(p).Method(4) 2435 if tt := v.Type(); tt != tfunc { 2436 t.Errorf("Variadic Method Type is %s; want %s", tt, tfunc) 2437 } 2438 i := ValueOf(v.Interface()).Call([]Value{ValueOf(points[0]), ValueOf(points[1]), ValueOf(points[2])})[0].Int() 2439 if i != want { 2440 t.Errorf("Variadic Method returned %d; want %d", i, want) 2441 } 2442 i = ValueOf(v.Interface()).CallSlice([]Value{ValueOf(points)})[0].Int() 2443 if i != want { 2444 t.Errorf("Variadic Method CallSlice returned %d; want %d", i, want) 2445 } 2446 2447 f := v.Interface().(func(...Point) int) 2448 i = int64(f(points[0], points[1], points[2])) 2449 if i != want { 2450 t.Errorf("Variadic Method Interface returned %d; want %d", i, want) 2451 } 2452 i = int64(f(points...)) 2453 if i != want { 2454 t.Errorf("Variadic Method Interface Slice returned %d; want %d", i, want) 2455 } 2456 } 2457 2458 type DirectIfaceT struct { 2459 p *int 2460 } 2461 2462 func (d DirectIfaceT) M() int { return *d.p } 2463 2464 func TestDirectIfaceMethod(t *testing.T) { 2465 x := 42 2466 v := DirectIfaceT{&x} 2467 typ := TypeOf(v) 2468 m, ok := typ.MethodByName("M") 2469 if !ok { 2470 t.Fatalf("cannot find method M") 2471 } 2472 in := []Value{ValueOf(v)} 2473 out := m.Func.Call(in) 2474 if got := out[0].Int(); got != 42 { 2475 t.Errorf("Call with value receiver got %d, want 42", got) 2476 } 2477 2478 pv := &v 2479 typ = TypeOf(pv) 2480 m, ok = typ.MethodByName("M") 2481 if !ok { 2482 t.Fatalf("cannot find method M") 2483 } 2484 in = []Value{ValueOf(pv)} 2485 out = m.Func.Call(in) 2486 if got := out[0].Int(); got != 42 { 2487 t.Errorf("Call with pointer receiver got %d, want 42", got) 2488 } 2489 } 2490 2491 // Reflect version of $GOROOT/test/method5.go 2492 2493 // Concrete types implementing M method. 2494 // Smaller than a word, word-sized, larger than a word. 2495 // Value and pointer receivers. 2496 2497 type Tinter interface { 2498 M(int, byte) (byte, int) 2499 } 2500 2501 type Tsmallv byte 2502 2503 func (v Tsmallv) M(x int, b byte) (byte, int) { return b, x + int(v) } 2504 2505 type Tsmallp byte 2506 2507 func (p *Tsmallp) M(x int, b byte) (byte, int) { return b, x + int(*p) } 2508 2509 type Twordv uintptr 2510 2511 func (v Twordv) M(x int, b byte) (byte, int) { return b, x + int(v) } 2512 2513 type Twordp uintptr 2514 2515 func (p *Twordp) M(x int, b byte) (byte, int) { return b, x + int(*p) } 2516 2517 type Tbigv [2]uintptr 2518 2519 func (v Tbigv) M(x int, b byte) (byte, int) { return b, x + int(v[0]) + int(v[1]) } 2520 2521 type Tbigp [2]uintptr 2522 2523 func (p *Tbigp) M(x int, b byte) (byte, int) { return b, x + int(p[0]) + int(p[1]) } 2524 2525 type tinter interface { 2526 m(int, byte) (byte, int) 2527 } 2528 2529 // Embedding via pointer. 2530 2531 type Tm1 struct { 2532 Tm2 2533 } 2534 2535 type Tm2 struct { 2536 *Tm3 2537 } 2538 2539 type Tm3 struct { 2540 *Tm4 2541 } 2542 2543 type Tm4 struct { 2544 } 2545 2546 func (t4 Tm4) M(x int, b byte) (byte, int) { return b, x + 40 } 2547 2548 func TestMethod5(t *testing.T) { 2549 CheckF := func(name string, f func(int, byte) (byte, int), inc int) { 2550 b, x := f(1000, 99) 2551 if b != 99 || x != 1000+inc { 2552 t.Errorf("%s(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc) 2553 } 2554 } 2555 2556 CheckV := func(name string, i Value, inc int) { 2557 bx := i.Method(0).Call([]Value{ValueOf(1000), ValueOf(byte(99))}) 2558 b := bx[0].Interface() 2559 x := bx[1].Interface() 2560 if b != byte(99) || x != 1000+inc { 2561 t.Errorf("direct %s.M(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc) 2562 } 2563 2564 CheckF(name+".M", i.Method(0).Interface().(func(int, byte) (byte, int)), inc) 2565 } 2566 2567 var TinterType = TypeOf(new(Tinter)).Elem() 2568 2569 CheckI := func(name string, i interface{}, inc int) { 2570 v := ValueOf(i) 2571 CheckV(name, v, inc) 2572 CheckV("(i="+name+")", v.Convert(TinterType), inc) 2573 } 2574 2575 sv := Tsmallv(1) 2576 CheckI("sv", sv, 1) 2577 CheckI("&sv", &sv, 1) 2578 2579 sp := Tsmallp(2) 2580 CheckI("&sp", &sp, 2) 2581 2582 wv := Twordv(3) 2583 CheckI("wv", wv, 3) 2584 CheckI("&wv", &wv, 3) 2585 2586 wp := Twordp(4) 2587 CheckI("&wp", &wp, 4) 2588 2589 bv := Tbigv([2]uintptr{5, 6}) 2590 CheckI("bv", bv, 11) 2591 CheckI("&bv", &bv, 11) 2592 2593 bp := Tbigp([2]uintptr{7, 8}) 2594 CheckI("&bp", &bp, 15) 2595 2596 t4 := Tm4{} 2597 t3 := Tm3{&t4} 2598 t2 := Tm2{&t3} 2599 t1 := Tm1{t2} 2600 CheckI("t4", t4, 40) 2601 CheckI("&t4", &t4, 40) 2602 CheckI("t3", t3, 40) 2603 CheckI("&t3", &t3, 40) 2604 CheckI("t2", t2, 40) 2605 CheckI("&t2", &t2, 40) 2606 CheckI("t1", t1, 40) 2607 CheckI("&t1", &t1, 40) 2608 2609 var tnil Tinter 2610 vnil := ValueOf(&tnil).Elem() 2611 shouldPanic("Method", func() { vnil.Method(0) }) 2612 } 2613 2614 func TestInterfaceSet(t *testing.T) { 2615 p := &Point{3, 4} 2616 2617 var s struct { 2618 I interface{} 2619 P interface { 2620 Dist(int) int 2621 } 2622 } 2623 sv := ValueOf(&s).Elem() 2624 sv.Field(0).Set(ValueOf(p)) 2625 if q := s.I.(*Point); q != p { 2626 t.Errorf("i: have %p want %p", q, p) 2627 } 2628 2629 pv := sv.Field(1) 2630 pv.Set(ValueOf(p)) 2631 if q := s.P.(*Point); q != p { 2632 t.Errorf("i: have %p want %p", q, p) 2633 } 2634 2635 i := pv.Method(0).Call([]Value{ValueOf(10)})[0].Int() 2636 if i != 250 { 2637 t.Errorf("Interface Method returned %d; want 250", i) 2638 } 2639 } 2640 2641 type T1 struct { 2642 a string 2643 int 2644 } 2645 2646 func TestAnonymousFields(t *testing.T) { 2647 var field StructField 2648 var ok bool 2649 var t1 T1 2650 type1 := TypeOf(t1) 2651 if field, ok = type1.FieldByName("int"); !ok { 2652 t.Fatal("no field 'int'") 2653 } 2654 if field.Index[0] != 1 { 2655 t.Error("field index should be 1; is", field.Index) 2656 } 2657 } 2658 2659 type FTest struct { 2660 s interface{} 2661 name string 2662 index []int 2663 value int 2664 } 2665 2666 type D1 struct { 2667 d int 2668 } 2669 type D2 struct { 2670 d int 2671 } 2672 2673 type S0 struct { 2674 A, B, C int 2675 D1 2676 D2 2677 } 2678 2679 type S1 struct { 2680 B int 2681 S0 2682 } 2683 2684 type S2 struct { 2685 A int 2686 *S1 2687 } 2688 2689 type S1x struct { 2690 S1 2691 } 2692 2693 type S1y struct { 2694 S1 2695 } 2696 2697 type S3 struct { 2698 S1x 2699 S2 2700 D, E int 2701 *S1y 2702 } 2703 2704 type S4 struct { 2705 *S4 2706 A int 2707 } 2708 2709 // The X in S6 and S7 annihilate, but they also block the X in S8.S9. 2710 type S5 struct { 2711 S6 2712 S7 2713 S8 2714 } 2715 2716 type S6 struct { 2717 X int 2718 } 2719 2720 type S7 S6 2721 2722 type S8 struct { 2723 S9 2724 } 2725 2726 type S9 struct { 2727 X int 2728 Y int 2729 } 2730 2731 // The X in S11.S6 and S12.S6 annihilate, but they also block the X in S13.S8.S9. 2732 type S10 struct { 2733 S11 2734 S12 2735 S13 2736 } 2737 2738 type S11 struct { 2739 S6 2740 } 2741 2742 type S12 struct { 2743 S6 2744 } 2745 2746 type S13 struct { 2747 S8 2748 } 2749 2750 // The X in S15.S11.S1 and S16.S11.S1 annihilate. 2751 type S14 struct { 2752 S15 2753 S16 2754 } 2755 2756 type S15 struct { 2757 S11 2758 } 2759 2760 type S16 struct { 2761 S11 2762 } 2763 2764 var fieldTests = []FTest{ 2765 {struct{}{}, "", nil, 0}, 2766 {struct{}{}, "Foo", nil, 0}, 2767 {S0{A: 'a'}, "A", []int{0}, 'a'}, 2768 {S0{}, "D", nil, 0}, 2769 {S1{S0: S0{A: 'a'}}, "A", []int{1, 0}, 'a'}, 2770 {S1{B: 'b'}, "B", []int{0}, 'b'}, 2771 {S1{}, "S0", []int{1}, 0}, 2772 {S1{S0: S0{C: 'c'}}, "C", []int{1, 2}, 'c'}, 2773 {S2{A: 'a'}, "A", []int{0}, 'a'}, 2774 {S2{}, "S1", []int{1}, 0}, 2775 {S2{S1: &S1{B: 'b'}}, "B", []int{1, 0}, 'b'}, 2776 {S2{S1: &S1{S0: S0{C: 'c'}}}, "C", []int{1, 1, 2}, 'c'}, 2777 {S2{}, "D", nil, 0}, 2778 {S3{}, "S1", nil, 0}, 2779 {S3{S2: S2{A: 'a'}}, "A", []int{1, 0}, 'a'}, 2780 {S3{}, "B", nil, 0}, 2781 {S3{D: 'd'}, "D", []int{2}, 0}, 2782 {S3{E: 'e'}, "E", []int{3}, 'e'}, 2783 {S4{A: 'a'}, "A", []int{1}, 'a'}, 2784 {S4{}, "B", nil, 0}, 2785 {S5{}, "X", nil, 0}, 2786 {S5{}, "Y", []int{2, 0, 1}, 0}, 2787 {S10{}, "X", nil, 0}, 2788 {S10{}, "Y", []int{2, 0, 0, 1}, 0}, 2789 {S14{}, "X", nil, 0}, 2790 } 2791 2792 func TestFieldByIndex(t *testing.T) { 2793 for _, test := range fieldTests { 2794 s := TypeOf(test.s) 2795 f := s.FieldByIndex(test.index) 2796 if f.Name != "" { 2797 if test.index != nil { 2798 if f.Name != test.name { 2799 t.Errorf("%s.%s found; want %s", s.Name(), f.Name, test.name) 2800 } 2801 } else { 2802 t.Errorf("%s.%s found", s.Name(), f.Name) 2803 } 2804 } else if len(test.index) > 0 { 2805 t.Errorf("%s.%s not found", s.Name(), test.name) 2806 } 2807 2808 if test.value != 0 { 2809 v := ValueOf(test.s).FieldByIndex(test.index) 2810 if v.IsValid() { 2811 if x, ok := v.Interface().(int); ok { 2812 if x != test.value { 2813 t.Errorf("%s%v is %d; want %d", s.Name(), test.index, x, test.value) 2814 } 2815 } else { 2816 t.Errorf("%s%v value not an int", s.Name(), test.index) 2817 } 2818 } else { 2819 t.Errorf("%s%v value not found", s.Name(), test.index) 2820 } 2821 } 2822 } 2823 } 2824 2825 func TestFieldByName(t *testing.T) { 2826 for _, test := range fieldTests { 2827 s := TypeOf(test.s) 2828 f, found := s.FieldByName(test.name) 2829 if found { 2830 if test.index != nil { 2831 // Verify field depth and index. 2832 if len(f.Index) != len(test.index) { 2833 t.Errorf("%s.%s depth %d; want %d: %v vs %v", s.Name(), test.name, len(f.Index), len(test.index), f.Index, test.index) 2834 } else { 2835 for i, x := range f.Index { 2836 if x != test.index[i] { 2837 t.Errorf("%s.%s.Index[%d] is %d; want %d", s.Name(), test.name, i, x, test.index[i]) 2838 } 2839 } 2840 } 2841 } else { 2842 t.Errorf("%s.%s found", s.Name(), f.Name) 2843 } 2844 } else if len(test.index) > 0 { 2845 t.Errorf("%s.%s not found", s.Name(), test.name) 2846 } 2847 2848 if test.value != 0 { 2849 v := ValueOf(test.s).FieldByName(test.name) 2850 if v.IsValid() { 2851 if x, ok := v.Interface().(int); ok { 2852 if x != test.value { 2853 t.Errorf("%s.%s is %d; want %d", s.Name(), test.name, x, test.value) 2854 } 2855 } else { 2856 t.Errorf("%s.%s value not an int", s.Name(), test.name) 2857 } 2858 } else { 2859 t.Errorf("%s.%s value not found", s.Name(), test.name) 2860 } 2861 } 2862 } 2863 } 2864 2865 func TestImportPath(t *testing.T) { 2866 tests := []struct { 2867 t Type 2868 path string 2869 }{ 2870 {TypeOf(&base64.Encoding{}).Elem(), "encoding/base64"}, 2871 {TypeOf(int(0)), ""}, 2872 {TypeOf(int8(0)), ""}, 2873 {TypeOf(int16(0)), ""}, 2874 {TypeOf(int32(0)), ""}, 2875 {TypeOf(int64(0)), ""}, 2876 {TypeOf(uint(0)), ""}, 2877 {TypeOf(uint8(0)), ""}, 2878 {TypeOf(uint16(0)), ""}, 2879 {TypeOf(uint32(0)), ""}, 2880 {TypeOf(uint64(0)), ""}, 2881 {TypeOf(uintptr(0)), ""}, 2882 {TypeOf(float32(0)), ""}, 2883 {TypeOf(float64(0)), ""}, 2884 {TypeOf(complex64(0)), ""}, 2885 {TypeOf(complex128(0)), ""}, 2886 {TypeOf(byte(0)), ""}, 2887 {TypeOf(rune(0)), ""}, 2888 {TypeOf([]byte(nil)), ""}, 2889 {TypeOf([]rune(nil)), ""}, 2890 {TypeOf(string("")), ""}, 2891 {TypeOf((*interface{})(nil)).Elem(), ""}, 2892 {TypeOf((*byte)(nil)), ""}, 2893 {TypeOf((*rune)(nil)), ""}, 2894 {TypeOf((*int64)(nil)), ""}, 2895 {TypeOf(map[string]int{}), ""}, 2896 {TypeOf((*error)(nil)).Elem(), ""}, 2897 {TypeOf((*Point)(nil)), ""}, 2898 {TypeOf((*Point)(nil)).Elem(), "reflect_test"}, 2899 } 2900 for _, test := range tests { 2901 if path := test.t.PkgPath(); path != test.path { 2902 t.Errorf("%v.PkgPath() = %q, want %q", test.t, path, test.path) 2903 } 2904 } 2905 } 2906 2907 func TestFieldPkgPath(t *testing.T) { 2908 type x int 2909 typ := TypeOf(struct { 2910 Exported string 2911 unexported string 2912 OtherPkgFields 2913 int // issue 21702 2914 *x // issue 21122 2915 }{}) 2916 2917 type pkgpathTest struct { 2918 index []int 2919 pkgPath string 2920 embedded bool 2921 exported bool 2922 } 2923 2924 checkPkgPath := func(name string, s []pkgpathTest) { 2925 for _, test := range s { 2926 f := typ.FieldByIndex(test.index) 2927 if got, want := f.PkgPath, test.pkgPath; got != want { 2928 t.Errorf("%s: Field(%d).PkgPath = %q, want %q", name, test.index, got, want) 2929 } 2930 if got, want := f.Anonymous, test.embedded; got != want { 2931 t.Errorf("%s: Field(%d).Anonymous = %v, want %v", name, test.index, got, want) 2932 } 2933 if got, want := f.IsExported(), test.exported; got != want { 2934 t.Errorf("%s: Field(%d).IsExported = %v, want %v", name, test.index, got, want) 2935 } 2936 } 2937 } 2938 2939 checkPkgPath("testStruct", []pkgpathTest{ 2940 {[]int{0}, "", false, true}, // Exported 2941 {[]int{1}, "reflect_test", false, false}, // unexported 2942 {[]int{2}, "", true, true}, // OtherPkgFields 2943 {[]int{2, 0}, "", false, true}, // OtherExported 2944 {[]int{2, 1}, "reflect", false, false}, // otherUnexported 2945 {[]int{3}, "reflect_test", true, false}, // int 2946 {[]int{4}, "reflect_test", true, false}, // *x 2947 }) 2948 2949 type localOtherPkgFields OtherPkgFields 2950 typ = TypeOf(localOtherPkgFields{}) 2951 checkPkgPath("localOtherPkgFields", []pkgpathTest{ 2952 {[]int{0}, "", false, true}, // OtherExported 2953 {[]int{1}, "reflect", false, false}, // otherUnexported 2954 }) 2955 } 2956 2957 func TestMethodPkgPath(t *testing.T) { 2958 type I interface { 2959 x() 2960 X() 2961 } 2962 typ := TypeOf((*interface { 2963 I 2964 y() 2965 Y() 2966 })(nil)).Elem() 2967 2968 tests := []struct { 2969 name string 2970 pkgPath string 2971 exported bool 2972 }{ 2973 {"X", "", true}, 2974 {"Y", "", true}, 2975 {"x", "reflect_test", false}, 2976 {"y", "reflect_test", false}, 2977 } 2978 2979 for _, test := range tests { 2980 m, _ := typ.MethodByName(test.name) 2981 if got, want := m.PkgPath, test.pkgPath; got != want { 2982 t.Errorf("MethodByName(%q).PkgPath = %q, want %q", test.name, got, want) 2983 } 2984 if got, want := m.IsExported(), test.exported; got != want { 2985 t.Errorf("MethodByName(%q).IsExported = %v, want %v", test.name, got, want) 2986 } 2987 } 2988 } 2989 2990 func TestVariadicType(t *testing.T) { 2991 // Test example from Type documentation. 2992 var f func(x int, y ...float64) 2993 typ := TypeOf(f) 2994 if typ.NumIn() == 2 && typ.In(0) == TypeOf(int(0)) { 2995 sl := typ.In(1) 2996 if sl.Kind() == Slice { 2997 if sl.Elem() == TypeOf(0.0) { 2998 // ok 2999 return 3000 } 3001 } 3002 } 3003 3004 // Failed 3005 t.Errorf("want NumIn() = 2, In(0) = int, In(1) = []float64") 3006 s := fmt.Sprintf("have NumIn() = %d", typ.NumIn()) 3007 for i := 0; i < typ.NumIn(); i++ { 3008 s += fmt.Sprintf(", In(%d) = %s", i, typ.In(i)) 3009 } 3010 t.Error(s) 3011 } 3012 3013 type inner struct { 3014 x int 3015 } 3016 3017 type outer struct { 3018 y int 3019 inner 3020 } 3021 3022 func (*inner) M() {} 3023 func (*outer) M() {} 3024 3025 func TestNestedMethods(t *testing.T) { 3026 typ := TypeOf((*outer)(nil)) 3027 if typ.NumMethod() != 1 || typ.Method(0).Func.Pointer() != ValueOf((*outer).M).Pointer() { 3028 t.Errorf("Wrong method table for outer: (M=%p)", (*outer).M) 3029 for i := 0; i < typ.NumMethod(); i++ { 3030 m := typ.Method(i) 3031 t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Pointer()) 3032 } 3033 } 3034 } 3035 3036 type unexp struct{} 3037 3038 func (*unexp) f() (int32, int8) { return 7, 7 } 3039 func (*unexp) g() (int64, int8) { return 8, 8 } 3040 3041 type unexpI interface { 3042 f() (int32, int8) 3043 } 3044 3045 var unexpi unexpI = new(unexp) 3046 3047 func TestUnexportedMethods(t *testing.T) { 3048 typ := TypeOf(unexpi) 3049 3050 if got := typ.NumMethod(); got != 0 { 3051 t.Errorf("NumMethod=%d, want 0 satisfied methods", got) 3052 } 3053 } 3054 3055 type InnerInt struct { 3056 X int 3057 } 3058 3059 type OuterInt struct { 3060 Y int 3061 InnerInt 3062 } 3063 3064 func (i *InnerInt) M() int { 3065 return i.X 3066 } 3067 3068 func TestEmbeddedMethods(t *testing.T) { 3069 typ := TypeOf((*OuterInt)(nil)) 3070 if typ.NumMethod() != 1 || typ.Method(0).Func.Pointer() != ValueOf((*OuterInt).M).Pointer() { 3071 t.Errorf("Wrong method table for OuterInt: (m=%p)", (*OuterInt).M) 3072 for i := 0; i < typ.NumMethod(); i++ { 3073 m := typ.Method(i) 3074 t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Pointer()) 3075 } 3076 } 3077 3078 i := &InnerInt{3} 3079 if v := ValueOf(i).Method(0).Call(nil)[0].Int(); v != 3 { 3080 t.Errorf("i.M() = %d, want 3", v) 3081 } 3082 3083 o := &OuterInt{1, InnerInt{2}} 3084 if v := ValueOf(o).Method(0).Call(nil)[0].Int(); v != 2 { 3085 t.Errorf("i.M() = %d, want 2", v) 3086 } 3087 3088 f := (*OuterInt).M 3089 if v := f(o); v != 2 { 3090 t.Errorf("f(o) = %d, want 2", v) 3091 } 3092 } 3093 3094 type FuncDDD func(...interface{}) error 3095 3096 func (f FuncDDD) M() {} 3097 3098 func TestNumMethodOnDDD(t *testing.T) { 3099 rv := ValueOf((FuncDDD)(nil)) 3100 if n := rv.NumMethod(); n != 1 { 3101 t.Fatalf("NumMethod()=%d, want 1", n) 3102 } 3103 } 3104 3105 func TestPtrTo(t *testing.T) { 3106 // This block of code means that the ptrToThis field of the 3107 // reflect data for *unsafe.Pointer is non zero, see 3108 // https://golang.org/issue/19003 3109 var x unsafe.Pointer 3110 var y = &x 3111 var z = &y 3112 3113 var i int 3114 3115 typ := TypeOf(z) 3116 for i = 0; i < 100; i++ { 3117 typ = PtrTo(typ) 3118 } 3119 for i = 0; i < 100; i++ { 3120 typ = typ.Elem() 3121 } 3122 if typ != TypeOf(z) { 3123 t.Errorf("after 100 PtrTo and Elem, have %s, want %s", typ, TypeOf(z)) 3124 } 3125 } 3126 3127 func TestPtrToGC(t *testing.T) { 3128 type T *uintptr 3129 tt := TypeOf(T(nil)) 3130 pt := PtrTo(tt) 3131 const n = 100 3132 var x []interface{} 3133 for i := 0; i < n; i++ { 3134 v := New(pt) 3135 p := new(*uintptr) 3136 *p = new(uintptr) 3137 **p = uintptr(i) 3138 v.Elem().Set(ValueOf(p).Convert(pt)) 3139 x = append(x, v.Interface()) 3140 } 3141 runtime.GC() 3142 3143 for i, xi := range x { 3144 k := ValueOf(xi).Elem().Elem().Elem().Interface().(uintptr) 3145 if k != uintptr(i) { 3146 t.Errorf("lost x[%d] = %d, want %d", i, k, i) 3147 } 3148 } 3149 } 3150 3151 func BenchmarkPtrTo(b *testing.B) { 3152 // Construct a type with a zero ptrToThis. 3153 type T struct{ int } 3154 t := SliceOf(TypeOf(T{})) 3155 ptrToThis := ValueOf(t).Elem().FieldByName("ptrToThis") 3156 if !ptrToThis.IsValid() { 3157 b.Fatalf("%v has no ptrToThis field; was it removed from rtype?", t) 3158 } 3159 if ptrToThis.Int() != 0 { 3160 b.Fatalf("%v.ptrToThis unexpectedly nonzero", t) 3161 } 3162 b.ResetTimer() 3163 3164 // Now benchmark calling PtrTo on it: we'll have to hit the ptrMap cache on 3165 // every call. 3166 b.RunParallel(func(pb *testing.PB) { 3167 for pb.Next() { 3168 PtrTo(t) 3169 } 3170 }) 3171 } 3172 3173 func TestAddr(t *testing.T) { 3174 var p struct { 3175 X, Y int 3176 } 3177 3178 v := ValueOf(&p) 3179 v = v.Elem() 3180 v = v.Addr() 3181 v = v.Elem() 3182 v = v.Field(0) 3183 v.SetInt(2) 3184 if p.X != 2 { 3185 t.Errorf("Addr.Elem.Set failed to set value") 3186 } 3187 3188 // Again but take address of the ValueOf value. 3189 // Exercises generation of PtrTypes not present in the binary. 3190 q := &p 3191 v = ValueOf(&q).Elem() 3192 v = v.Addr() 3193 v = v.Elem() 3194 v = v.Elem() 3195 v = v.Addr() 3196 v = v.Elem() 3197 v = v.Field(0) 3198 v.SetInt(3) 3199 if p.X != 3 { 3200 t.Errorf("Addr.Elem.Set failed to set value") 3201 } 3202 3203 // Starting without pointer we should get changed value 3204 // in interface. 3205 qq := p 3206 v = ValueOf(&qq).Elem() 3207 v0 := v 3208 v = v.Addr() 3209 v = v.Elem() 3210 v = v.Field(0) 3211 v.SetInt(4) 3212 if p.X != 3 { // should be unchanged from last time 3213 t.Errorf("somehow value Set changed original p") 3214 } 3215 p = v0.Interface().(struct { 3216 X, Y int 3217 }) 3218 if p.X != 4 { 3219 t.Errorf("Addr.Elem.Set valued to set value in top value") 3220 } 3221 3222 // Verify that taking the address of a type gives us a pointer 3223 // which we can convert back using the usual interface 3224 // notation. 3225 var s struct { 3226 B *bool 3227 } 3228 ps := ValueOf(&s).Elem().Field(0).Addr().Interface() 3229 *(ps.(**bool)) = new(bool) 3230 if s.B == nil { 3231 t.Errorf("Addr.Interface direct assignment failed") 3232 } 3233 } 3234 3235 func noAlloc(t *testing.T, n int, f func(int)) { 3236 if testing.Short() { 3237 t.Skip("skipping malloc count in short mode") 3238 } 3239 if runtime.GOMAXPROCS(0) > 1 { 3240 t.Skip("skipping; GOMAXPROCS>1") 3241 } 3242 i := -1 3243 allocs := testing.AllocsPerRun(n, func() { 3244 f(i) 3245 i++ 3246 }) 3247 if allocs > 0 { 3248 t.Errorf("%d iterations: got %v mallocs, want 0", n, allocs) 3249 } 3250 } 3251 3252 func TestAllocations(t *testing.T) { 3253 noAlloc(t, 100, func(j int) { 3254 var i interface{} 3255 var v Value 3256 3257 // We can uncomment this when compiler escape analysis 3258 // is good enough to see that the integer assigned to i 3259 // does not escape and therefore need not be allocated. 3260 // 3261 // i = 42 + j 3262 // v = ValueOf(i) 3263 // if int(v.Int()) != 42+j { 3264 // panic("wrong int") 3265 // } 3266 3267 i = func(j int) int { return j } 3268 v = ValueOf(i) 3269 if v.Interface().(func(int) int)(j) != j { 3270 panic("wrong result") 3271 } 3272 }) 3273 } 3274 3275 func TestSmallNegativeInt(t *testing.T) { 3276 i := int16(-1) 3277 v := ValueOf(i) 3278 if v.Int() != -1 { 3279 t.Errorf("int16(-1).Int() returned %v", v.Int()) 3280 } 3281 } 3282 3283 func TestIndex(t *testing.T) { 3284 xs := []byte{1, 2, 3, 4, 5, 6, 7, 8} 3285 v := ValueOf(xs).Index(3).Interface().(byte) 3286 if v != xs[3] { 3287 t.Errorf("xs.Index(3) = %v; expected %v", v, xs[3]) 3288 } 3289 xa := [8]byte{10, 20, 30, 40, 50, 60, 70, 80} 3290 v = ValueOf(xa).Index(2).Interface().(byte) 3291 if v != xa[2] { 3292 t.Errorf("xa.Index(2) = %v; expected %v", v, xa[2]) 3293 } 3294 s := "0123456789" 3295 v = ValueOf(s).Index(3).Interface().(byte) 3296 if v != s[3] { 3297 t.Errorf("s.Index(3) = %v; expected %v", v, s[3]) 3298 } 3299 } 3300 3301 func TestSlice(t *testing.T) { 3302 xs := []int{1, 2, 3, 4, 5, 6, 7, 8} 3303 v := ValueOf(xs).Slice(3, 5).Interface().([]int) 3304 if len(v) != 2 { 3305 t.Errorf("len(xs.Slice(3, 5)) = %d", len(v)) 3306 } 3307 if cap(v) != 5 { 3308 t.Errorf("cap(xs.Slice(3, 5)) = %d", cap(v)) 3309 } 3310 if !DeepEqual(v[0:5], xs[3:]) { 3311 t.Errorf("xs.Slice(3, 5)[0:5] = %v", v[0:5]) 3312 } 3313 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} 3314 v = ValueOf(&xa).Elem().Slice(2, 5).Interface().([]int) 3315 if len(v) != 3 { 3316 t.Errorf("len(xa.Slice(2, 5)) = %d", len(v)) 3317 } 3318 if cap(v) != 6 { 3319 t.Errorf("cap(xa.Slice(2, 5)) = %d", cap(v)) 3320 } 3321 if !DeepEqual(v[0:6], xa[2:]) { 3322 t.Errorf("xs.Slice(2, 5)[0:6] = %v", v[0:6]) 3323 } 3324 s := "0123456789" 3325 vs := ValueOf(s).Slice(3, 5).Interface().(string) 3326 if vs != s[3:5] { 3327 t.Errorf("s.Slice(3, 5) = %q; expected %q", vs, s[3:5]) 3328 } 3329 3330 rv := ValueOf(&xs).Elem() 3331 rv = rv.Slice(3, 4) 3332 ptr2 := rv.Pointer() 3333 rv = rv.Slice(5, 5) 3334 ptr3 := rv.Pointer() 3335 if ptr3 != ptr2 { 3336 t.Errorf("xs.Slice(3,4).Slice3(5,5).Pointer() = %#x, want %#x", ptr3, ptr2) 3337 } 3338 } 3339 3340 func TestSlice3(t *testing.T) { 3341 xs := []int{1, 2, 3, 4, 5, 6, 7, 8} 3342 v := ValueOf(xs).Slice3(3, 5, 7).Interface().([]int) 3343 if len(v) != 2 { 3344 t.Errorf("len(xs.Slice3(3, 5, 7)) = %d", len(v)) 3345 } 3346 if cap(v) != 4 { 3347 t.Errorf("cap(xs.Slice3(3, 5, 7)) = %d", cap(v)) 3348 } 3349 if !DeepEqual(v[0:4], xs[3:7:7]) { 3350 t.Errorf("xs.Slice3(3, 5, 7)[0:4] = %v", v[0:4]) 3351 } 3352 rv := ValueOf(&xs).Elem() 3353 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) }) 3354 shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) }) 3355 shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) }) 3356 3357 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} 3358 v = ValueOf(&xa).Elem().Slice3(2, 5, 6).Interface().([]int) 3359 if len(v) != 3 { 3360 t.Errorf("len(xa.Slice(2, 5, 6)) = %d", len(v)) 3361 } 3362 if cap(v) != 4 { 3363 t.Errorf("cap(xa.Slice(2, 5, 6)) = %d", cap(v)) 3364 } 3365 if !DeepEqual(v[0:4], xa[2:6:6]) { 3366 t.Errorf("xs.Slice(2, 5, 6)[0:4] = %v", v[0:4]) 3367 } 3368 rv = ValueOf(&xa).Elem() 3369 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) }) 3370 shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) }) 3371 shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) }) 3372 3373 s := "hello world" 3374 rv = ValueOf(&s).Elem() 3375 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 3) }) 3376 3377 rv = ValueOf(&xs).Elem() 3378 rv = rv.Slice3(3, 5, 7) 3379 ptr2 := rv.Pointer() 3380 rv = rv.Slice3(4, 4, 4) 3381 ptr3 := rv.Pointer() 3382 if ptr3 != ptr2 { 3383 t.Errorf("xs.Slice3(3,5,7).Slice3(4,4,4).Pointer() = %#x, want %#x", ptr3, ptr2) 3384 } 3385 } 3386 3387 func TestSetLenCap(t *testing.T) { 3388 xs := []int{1, 2, 3, 4, 5, 6, 7, 8} 3389 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} 3390 3391 vs := ValueOf(&xs).Elem() 3392 shouldPanic("SetLen", func() { vs.SetLen(10) }) 3393 shouldPanic("SetCap", func() { vs.SetCap(10) }) 3394 shouldPanic("SetLen", func() { vs.SetLen(-1) }) 3395 shouldPanic("SetCap", func() { vs.SetCap(-1) }) 3396 shouldPanic("SetCap", func() { vs.SetCap(6) }) // smaller than len 3397 vs.SetLen(5) 3398 if len(xs) != 5 || cap(xs) != 8 { 3399 t.Errorf("after SetLen(5), len, cap = %d, %d, want 5, 8", len(xs), cap(xs)) 3400 } 3401 vs.SetCap(6) 3402 if len(xs) != 5 || cap(xs) != 6 { 3403 t.Errorf("after SetCap(6), len, cap = %d, %d, want 5, 6", len(xs), cap(xs)) 3404 } 3405 vs.SetCap(5) 3406 if len(xs) != 5 || cap(xs) != 5 { 3407 t.Errorf("after SetCap(5), len, cap = %d, %d, want 5, 5", len(xs), cap(xs)) 3408 } 3409 shouldPanic("SetCap", func() { vs.SetCap(4) }) // smaller than len 3410 shouldPanic("SetLen", func() { vs.SetLen(6) }) // bigger than cap 3411 3412 va := ValueOf(&xa).Elem() 3413 shouldPanic("SetLen", func() { va.SetLen(8) }) 3414 shouldPanic("SetCap", func() { va.SetCap(8) }) 3415 } 3416 3417 func TestVariadic(t *testing.T) { 3418 var b bytes.Buffer 3419 V := ValueOf 3420 3421 b.Reset() 3422 V(fmt.Fprintf).Call([]Value{V(&b), V("%s, %d world"), V("hello"), V(42)}) 3423 if b.String() != "hello, 42 world" { 3424 t.Errorf("after Fprintf Call: %q != %q", b.String(), "hello 42 world") 3425 } 3426 3427 b.Reset() 3428 V(fmt.Fprintf).CallSlice([]Value{V(&b), V("%s, %d world"), V([]interface{}{"hello", 42})}) 3429 if b.String() != "hello, 42 world" { 3430 t.Errorf("after Fprintf CallSlice: %q != %q", b.String(), "hello 42 world") 3431 } 3432 } 3433 3434 func TestFuncArg(t *testing.T) { 3435 f1 := func(i int, f func(int) int) int { return f(i) } 3436 f2 := func(i int) int { return i + 1 } 3437 r := ValueOf(f1).Call([]Value{ValueOf(100), ValueOf(f2)}) 3438 if r[0].Int() != 101 { 3439 t.Errorf("function returned %d, want 101", r[0].Int()) 3440 } 3441 } 3442 3443 func TestStructArg(t *testing.T) { 3444 type padded struct { 3445 B string 3446 C int32 3447 } 3448 var ( 3449 gotA padded 3450 gotB uint32 3451 wantA = padded{"3", 4} 3452 wantB = uint32(5) 3453 ) 3454 f := func(a padded, b uint32) { 3455 gotA, gotB = a, b 3456 } 3457 ValueOf(f).Call([]Value{ValueOf(wantA), ValueOf(wantB)}) 3458 if gotA != wantA || gotB != wantB { 3459 t.Errorf("function called with (%v, %v), want (%v, %v)", gotA, gotB, wantA, wantB) 3460 } 3461 } 3462 3463 var tagGetTests = []struct { 3464 Tag StructTag 3465 Key string 3466 Value string 3467 }{ 3468 {`protobuf:"PB(1,2)"`, `protobuf`, `PB(1,2)`}, 3469 {`protobuf:"PB(1,2)"`, `foo`, ``}, 3470 {`protobuf:"PB(1,2)"`, `rotobuf`, ``}, 3471 {`protobuf:"PB(1,2)" json:"name"`, `json`, `name`}, 3472 {`protobuf:"PB(1,2)" json:"name"`, `protobuf`, `PB(1,2)`}, 3473 {`k0:"values contain spaces" k1:"and\ttabs"`, "k0", "values contain spaces"}, 3474 {`k0:"values contain spaces" k1:"and\ttabs"`, "k1", "and\ttabs"}, 3475 } 3476 3477 func TestTagGet(t *testing.T) { 3478 for _, tt := range tagGetTests { 3479 if v := tt.Tag.Get(tt.Key); v != tt.Value { 3480 t.Errorf("StructTag(%#q).Get(%#q) = %#q, want %#q", tt.Tag, tt.Key, v, tt.Value) 3481 } 3482 } 3483 } 3484 3485 func TestBytes(t *testing.T) { 3486 type B []byte 3487 x := B{1, 2, 3, 4} 3488 y := ValueOf(x).Bytes() 3489 if !bytes.Equal(x, y) { 3490 t.Fatalf("ValueOf(%v).Bytes() = %v", x, y) 3491 } 3492 if &x[0] != &y[0] { 3493 t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0]) 3494 } 3495 } 3496 3497 func TestSetBytes(t *testing.T) { 3498 type B []byte 3499 var x B 3500 y := []byte{1, 2, 3, 4} 3501 ValueOf(&x).Elem().SetBytes(y) 3502 if !bytes.Equal(x, y) { 3503 t.Fatalf("ValueOf(%v).Bytes() = %v", x, y) 3504 } 3505 if &x[0] != &y[0] { 3506 t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0]) 3507 } 3508 } 3509 3510 type Private struct { 3511 x int 3512 y **int 3513 Z int 3514 } 3515 3516 func (p *Private) m() { 3517 } 3518 3519 type private struct { 3520 Z int 3521 z int 3522 S string 3523 A [1]Private 3524 T []Private 3525 } 3526 3527 func (p *private) P() { 3528 } 3529 3530 type Public struct { 3531 X int 3532 Y **int 3533 private 3534 } 3535 3536 func (p *Public) M() { 3537 } 3538 3539 func TestUnexported(t *testing.T) { 3540 var pub Public 3541 pub.S = "S" 3542 pub.T = pub.A[:] 3543 v := ValueOf(&pub) 3544 isValid(v.Elem().Field(0)) 3545 isValid(v.Elem().Field(1)) 3546 isValid(v.Elem().Field(2)) 3547 isValid(v.Elem().FieldByName("X")) 3548 isValid(v.Elem().FieldByName("Y")) 3549 isValid(v.Elem().FieldByName("Z")) 3550 isValid(v.Type().Method(0).Func) 3551 m, _ := v.Type().MethodByName("M") 3552 isValid(m.Func) 3553 m, _ = v.Type().MethodByName("P") 3554 isValid(m.Func) 3555 isNonNil(v.Elem().Field(0).Interface()) 3556 isNonNil(v.Elem().Field(1).Interface()) 3557 isNonNil(v.Elem().Field(2).Field(2).Index(0)) 3558 isNonNil(v.Elem().FieldByName("X").Interface()) 3559 isNonNil(v.Elem().FieldByName("Y").Interface()) 3560 isNonNil(v.Elem().FieldByName("Z").Interface()) 3561 isNonNil(v.Elem().FieldByName("S").Index(0).Interface()) 3562 isNonNil(v.Type().Method(0).Func.Interface()) 3563 m, _ = v.Type().MethodByName("P") 3564 isNonNil(m.Func.Interface()) 3565 3566 var priv Private 3567 v = ValueOf(&priv) 3568 isValid(v.Elem().Field(0)) 3569 isValid(v.Elem().Field(1)) 3570 isValid(v.Elem().FieldByName("x")) 3571 isValid(v.Elem().FieldByName("y")) 3572 shouldPanic("Interface", func() { v.Elem().Field(0).Interface() }) 3573 shouldPanic("Interface", func() { v.Elem().Field(1).Interface() }) 3574 shouldPanic("Interface", func() { v.Elem().FieldByName("x").Interface() }) 3575 shouldPanic("Interface", func() { v.Elem().FieldByName("y").Interface() }) 3576 shouldPanic("Method", func() { v.Type().Method(0) }) 3577 } 3578 3579 func TestSetPanic(t *testing.T) { 3580 ok := func(f func()) { f() } 3581 bad := func(f func()) { shouldPanic("Set", f) } 3582 clear := func(v Value) { v.Set(Zero(v.Type())) } 3583 3584 type t0 struct { 3585 W int 3586 } 3587 3588 type t1 struct { 3589 Y int 3590 t0 3591 } 3592 3593 type T2 struct { 3594 Z int 3595 namedT0 t0 3596 } 3597 3598 type T struct { 3599 X int 3600 t1 3601 T2 3602 NamedT1 t1 3603 NamedT2 T2 3604 namedT1 t1 3605 namedT2 T2 3606 } 3607 3608 // not addressable 3609 v := ValueOf(T{}) 3610 bad(func() { clear(v.Field(0)) }) // .X 3611 bad(func() { clear(v.Field(1)) }) // .t1 3612 bad(func() { clear(v.Field(1).Field(0)) }) // .t1.Y 3613 bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0 3614 bad(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W 3615 bad(func() { clear(v.Field(2)) }) // .T2 3616 bad(func() { clear(v.Field(2).Field(0)) }) // .T2.Z 3617 bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0 3618 bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W 3619 bad(func() { clear(v.Field(3)) }) // .NamedT1 3620 bad(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y 3621 bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0 3622 bad(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W 3623 bad(func() { clear(v.Field(4)) }) // .NamedT2 3624 bad(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z 3625 bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0 3626 bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W 3627 bad(func() { clear(v.Field(5)) }) // .namedT1 3628 bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y 3629 bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0 3630 bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W 3631 bad(func() { clear(v.Field(6)) }) // .namedT2 3632 bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z 3633 bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0 3634 bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W 3635 3636 // addressable 3637 v = ValueOf(&T{}).Elem() 3638 ok(func() { clear(v.Field(0)) }) // .X 3639 bad(func() { clear(v.Field(1)) }) // .t1 3640 ok(func() { clear(v.Field(1).Field(0)) }) // .t1.Y 3641 bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0 3642 ok(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W 3643 ok(func() { clear(v.Field(2)) }) // .T2 3644 ok(func() { clear(v.Field(2).Field(0)) }) // .T2.Z 3645 bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0 3646 bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W 3647 ok(func() { clear(v.Field(3)) }) // .NamedT1 3648 ok(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y 3649 bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0 3650 ok(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W 3651 ok(func() { clear(v.Field(4)) }) // .NamedT2 3652 ok(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z 3653 bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0 3654 bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W 3655 bad(func() { clear(v.Field(5)) }) // .namedT1 3656 bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y 3657 bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0 3658 bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W 3659 bad(func() { clear(v.Field(6)) }) // .namedT2 3660 bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z 3661 bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0 3662 bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W 3663 } 3664 3665 type timp int 3666 3667 func (t timp) W() {} 3668 func (t timp) Y() {} 3669 func (t timp) w() {} 3670 func (t timp) y() {} 3671 3672 func TestCallPanic(t *testing.T) { 3673 type t0 interface { 3674 W() 3675 w() 3676 } 3677 type T1 interface { 3678 Y() 3679 y() 3680 } 3681 type T2 struct { 3682 T1 3683 t0 3684 } 3685 type T struct { 3686 t0 // 0 3687 T1 // 1 3688 3689 NamedT0 t0 // 2 3690 NamedT1 T1 // 3 3691 NamedT2 T2 // 4 3692 3693 namedT0 t0 // 5 3694 namedT1 T1 // 6 3695 namedT2 T2 // 7 3696 } 3697 ok := func(f func()) { f() } 3698 badCall := func(f func()) { shouldPanic("Call", f) } 3699 badMethod := func(f func()) { shouldPanic("Method", f) } 3700 call := func(v Value) { v.Call(nil) } 3701 3702 i := timp(0) 3703 v := ValueOf(T{i, i, i, i, T2{i, i}, i, i, T2{i, i}}) 3704 badCall(func() { call(v.Field(0).Method(0)) }) // .t0.W 3705 badCall(func() { call(v.Field(0).Elem().Method(0)) }) // .t0.W 3706 badCall(func() { call(v.Field(0).Method(1)) }) // .t0.w 3707 badMethod(func() { call(v.Field(0).Elem().Method(2)) }) // .t0.w 3708 ok(func() { call(v.Field(1).Method(0)) }) // .T1.Y 3709 ok(func() { call(v.Field(1).Elem().Method(0)) }) // .T1.Y 3710 badCall(func() { call(v.Field(1).Method(1)) }) // .T1.y 3711 badMethod(func() { call(v.Field(1).Elem().Method(2)) }) // .T1.y 3712 3713 ok(func() { call(v.Field(2).Method(0)) }) // .NamedT0.W 3714 ok(func() { call(v.Field(2).Elem().Method(0)) }) // .NamedT0.W 3715 badCall(func() { call(v.Field(2).Method(1)) }) // .NamedT0.w 3716 badMethod(func() { call(v.Field(2).Elem().Method(2)) }) // .NamedT0.w 3717 3718 ok(func() { call(v.Field(3).Method(0)) }) // .NamedT1.Y 3719 ok(func() { call(v.Field(3).Elem().Method(0)) }) // .NamedT1.Y 3720 badCall(func() { call(v.Field(3).Method(1)) }) // .NamedT1.y 3721 badMethod(func() { call(v.Field(3).Elem().Method(3)) }) // .NamedT1.y 3722 3723 ok(func() { call(v.Field(4).Field(0).Method(0)) }) // .NamedT2.T1.Y 3724 ok(func() { call(v.Field(4).Field(0).Elem().Method(0)) }) // .NamedT2.T1.W 3725 badCall(func() { call(v.Field(4).Field(1).Method(0)) }) // .NamedT2.t0.W 3726 badCall(func() { call(v.Field(4).Field(1).Elem().Method(0)) }) // .NamedT2.t0.W 3727 3728 badCall(func() { call(v.Field(5).Method(0)) }) // .namedT0.W 3729 badCall(func() { call(v.Field(5).Elem().Method(0)) }) // .namedT0.W 3730 badCall(func() { call(v.Field(5).Method(1)) }) // .namedT0.w 3731 badMethod(func() { call(v.Field(5).Elem().Method(2)) }) // .namedT0.w 3732 3733 badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.Y 3734 badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.Y 3735 badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.y 3736 badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.y 3737 3738 badCall(func() { call(v.Field(7).Field(0).Method(0)) }) // .namedT2.T1.Y 3739 badCall(func() { call(v.Field(7).Field(0).Elem().Method(0)) }) // .namedT2.T1.W 3740 badCall(func() { call(v.Field(7).Field(1).Method(0)) }) // .namedT2.t0.W 3741 badCall(func() { call(v.Field(7).Field(1).Elem().Method(0)) }) // .namedT2.t0.W 3742 } 3743 3744 func shouldPanic(expect string, f func()) { 3745 defer func() { 3746 r := recover() 3747 if r == nil { 3748 panic("did not panic") 3749 } 3750 if expect != "" { 3751 var s string 3752 switch r := r.(type) { 3753 case string: 3754 s = r 3755 case *ValueError: 3756 s = r.Error() 3757 default: 3758 panic(fmt.Sprintf("panicked with unexpected type %T", r)) 3759 } 3760 if !strings.HasPrefix(s, "reflect") { 3761 panic(`panic string does not start with "reflect": ` + s) 3762 } 3763 if !strings.Contains(s, expect) { 3764 panic(`panic string does not contain "` + expect + `": ` + s) 3765 } 3766 } 3767 }() 3768 f() 3769 } 3770 3771 func isNonNil(x interface{}) { 3772 if x == nil { 3773 panic("nil interface") 3774 } 3775 } 3776 3777 func isValid(v Value) { 3778 if !v.IsValid() { 3779 panic("zero Value") 3780 } 3781 } 3782 3783 func TestAlias(t *testing.T) { 3784 x := string("hello") 3785 v := ValueOf(&x).Elem() 3786 oldvalue := v.Interface() 3787 v.SetString("world") 3788 newvalue := v.Interface() 3789 3790 if oldvalue != "hello" || newvalue != "world" { 3791 t.Errorf("aliasing: old=%q new=%q, want hello, world", oldvalue, newvalue) 3792 } 3793 } 3794 3795 var V = ValueOf 3796 3797 func EmptyInterfaceV(x interface{}) Value { 3798 return ValueOf(&x).Elem() 3799 } 3800 3801 func ReaderV(x io.Reader) Value { 3802 return ValueOf(&x).Elem() 3803 } 3804 3805 func ReadWriterV(x io.ReadWriter) Value { 3806 return ValueOf(&x).Elem() 3807 } 3808 3809 type Empty struct{} 3810 type MyStruct struct { 3811 x int `some:"tag"` 3812 } 3813 type MyStruct1 struct { 3814 x struct { 3815 int `some:"bar"` 3816 } 3817 } 3818 type MyStruct2 struct { 3819 x struct { 3820 int `some:"foo"` 3821 } 3822 } 3823 type MyString string 3824 type MyBytes []byte 3825 type MyBytesArrayPtr0 *[0]byte 3826 type MyBytesArrayPtr *[4]byte 3827 type MyBytesArray0 [0]byte 3828 type MyBytesArray [4]byte 3829 type MyRunes []int32 3830 type MyFunc func() 3831 type MyByte byte 3832 3833 type IntChan chan int 3834 type IntChanRecv <-chan int 3835 type IntChanSend chan<- int 3836 type BytesChan chan []byte 3837 type BytesChanRecv <-chan []byte 3838 type BytesChanSend chan<- []byte 3839 3840 var convertTests = []struct { 3841 in Value 3842 out Value 3843 }{ 3844 // numbers 3845 /* 3846 Edit .+1,/\*\//-1>cat >/tmp/x.go && go run /tmp/x.go 3847 3848 package main 3849 3850 import "fmt" 3851 3852 var numbers = []string{ 3853 "int8", "uint8", "int16", "uint16", 3854 "int32", "uint32", "int64", "uint64", 3855 "int", "uint", "uintptr", 3856 "float32", "float64", 3857 } 3858 3859 func main() { 3860 // all pairs but in an unusual order, 3861 // to emit all the int8, uint8 cases 3862 // before n grows too big. 3863 n := 1 3864 for i, f := range numbers { 3865 for _, g := range numbers[i:] { 3866 fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", f, n, g, n) 3867 n++ 3868 if f != g { 3869 fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", g, n, f, n) 3870 n++ 3871 } 3872 } 3873 } 3874 } 3875 */ 3876 {V(int8(1)), V(int8(1))}, 3877 {V(int8(2)), V(uint8(2))}, 3878 {V(uint8(3)), V(int8(3))}, 3879 {V(int8(4)), V(int16(4))}, 3880 {V(int16(5)), V(int8(5))}, 3881 {V(int8(6)), V(uint16(6))}, 3882 {V(uint16(7)), V(int8(7))}, 3883 {V(int8(8)), V(int32(8))}, 3884 {V(int32(9)), V(int8(9))}, 3885 {V(int8(10)), V(uint32(10))}, 3886 {V(uint32(11)), V(int8(11))}, 3887 {V(int8(12)), V(int64(12))}, 3888 {V(int64(13)), V(int8(13))}, 3889 {V(int8(14)), V(uint64(14))}, 3890 {V(uint64(15)), V(int8(15))}, 3891 {V(int8(16)), V(int(16))}, 3892 {V(int(17)), V(int8(17))}, 3893 {V(int8(18)), V(uint(18))}, 3894 {V(uint(19)), V(int8(19))}, 3895 {V(int8(20)), V(uintptr(20))}, 3896 {V(uintptr(21)), V(int8(21))}, 3897 {V(int8(22)), V(float32(22))}, 3898 {V(float32(23)), V(int8(23))}, 3899 {V(int8(24)), V(float64(24))}, 3900 {V(float64(25)), V(int8(25))}, 3901 {V(uint8(26)), V(uint8(26))}, 3902 {V(uint8(27)), V(int16(27))}, 3903 {V(int16(28)), V(uint8(28))}, 3904 {V(uint8(29)), V(uint16(29))}, 3905 {V(uint16(30)), V(uint8(30))}, 3906 {V(uint8(31)), V(int32(31))}, 3907 {V(int32(32)), V(uint8(32))}, 3908 {V(uint8(33)), V(uint32(33))}, 3909 {V(uint32(34)), V(uint8(34))}, 3910 {V(uint8(35)), V(int64(35))}, 3911 {V(int64(36)), V(uint8(36))}, 3912 {V(uint8(37)), V(uint64(37))}, 3913 {V(uint64(38)), V(uint8(38))}, 3914 {V(uint8(39)), V(int(39))}, 3915 {V(int(40)), V(uint8(40))}, 3916 {V(uint8(41)), V(uint(41))}, 3917 {V(uint(42)), V(uint8(42))}, 3918 {V(uint8(43)), V(uintptr(43))}, 3919 {V(uintptr(44)), V(uint8(44))}, 3920 {V(uint8(45)), V(float32(45))}, 3921 {V(float32(46)), V(uint8(46))}, 3922 {V(uint8(47)), V(float64(47))}, 3923 {V(float64(48)), V(uint8(48))}, 3924 {V(int16(49)), V(int16(49))}, 3925 {V(int16(50)), V(uint16(50))}, 3926 {V(uint16(51)), V(int16(51))}, 3927 {V(int16(52)), V(int32(52))}, 3928 {V(int32(53)), V(int16(53))}, 3929 {V(int16(54)), V(uint32(54))}, 3930 {V(uint32(55)), V(int16(55))}, 3931 {V(int16(56)), V(int64(56))}, 3932 {V(int64(57)), V(int16(57))}, 3933 {V(int16(58)), V(uint64(58))}, 3934 {V(uint64(59)), V(int16(59))}, 3935 {V(int16(60)), V(int(60))}, 3936 {V(int(61)), V(int16(61))}, 3937 {V(int16(62)), V(uint(62))}, 3938 {V(uint(63)), V(int16(63))}, 3939 {V(int16(64)), V(uintptr(64))}, 3940 {V(uintptr(65)), V(int16(65))}, 3941 {V(int16(66)), V(float32(66))}, 3942 {V(float32(67)), V(int16(67))}, 3943 {V(int16(68)), V(float64(68))}, 3944 {V(float64(69)), V(int16(69))}, 3945 {V(uint16(70)), V(uint16(70))}, 3946 {V(uint16(71)), V(int32(71))}, 3947 {V(int32(72)), V(uint16(72))}, 3948 {V(uint16(73)), V(uint32(73))}, 3949 {V(uint32(74)), V(uint16(74))}, 3950 {V(uint16(75)), V(int64(75))}, 3951 {V(int64(76)), V(uint16(76))}, 3952 {V(uint16(77)), V(uint64(77))}, 3953 {V(uint64(78)), V(uint16(78))}, 3954 {V(uint16(79)), V(int(79))}, 3955 {V(int(80)), V(uint16(80))}, 3956 {V(uint16(81)), V(uint(81))}, 3957 {V(uint(82)), V(uint16(82))}, 3958 {V(uint16(83)), V(uintptr(83))}, 3959 {V(uintptr(84)), V(uint16(84))}, 3960 {V(uint16(85)), V(float32(85))}, 3961 {V(float32(86)), V(uint16(86))}, 3962 {V(uint16(87)), V(float64(87))}, 3963 {V(float64(88)), V(uint16(88))}, 3964 {V(int32(89)), V(int32(89))}, 3965 {V(int32(90)), V(uint32(90))}, 3966 {V(uint32(91)), V(int32(91))}, 3967 {V(int32(92)), V(int64(92))}, 3968 {V(int64(93)), V(int32(93))}, 3969 {V(int32(94)), V(uint64(94))}, 3970 {V(uint64(95)), V(int32(95))}, 3971 {V(int32(96)), V(int(96))}, 3972 {V(int(97)), V(int32(97))}, 3973 {V(int32(98)), V(uint(98))}, 3974 {V(uint(99)), V(int32(99))}, 3975 {V(int32(100)), V(uintptr(100))}, 3976 {V(uintptr(101)), V(int32(101))}, 3977 {V(int32(102)), V(float32(102))}, 3978 {V(float32(103)), V(int32(103))}, 3979 {V(int32(104)), V(float64(104))}, 3980 {V(float64(105)), V(int32(105))}, 3981 {V(uint32(106)), V(uint32(106))}, 3982 {V(uint32(107)), V(int64(107))}, 3983 {V(int64(108)), V(uint32(108))}, 3984 {V(uint32(109)), V(uint64(109))}, 3985 {V(uint64(110)), V(uint32(110))}, 3986 {V(uint32(111)), V(int(111))}, 3987 {V(int(112)), V(uint32(112))}, 3988 {V(uint32(113)), V(uint(113))}, 3989 {V(uint(114)), V(uint32(114))}, 3990 {V(uint32(115)), V(uintptr(115))}, 3991 {V(uintptr(116)), V(uint32(116))}, 3992 {V(uint32(117)), V(float32(117))}, 3993 {V(float32(118)), V(uint32(118))}, 3994 {V(uint32(119)), V(float64(119))}, 3995 {V(float64(120)), V(uint32(120))}, 3996 {V(int64(121)), V(int64(121))}, 3997 {V(int64(122)), V(uint64(122))}, 3998 {V(uint64(123)), V(int64(123))}, 3999 {V(int64(124)), V(int(124))}, 4000 {V(int(125)), V(int64(125))}, 4001 {V(int64(126)), V(uint(126))}, 4002 {V(uint(127)), V(int64(127))}, 4003 {V(int64(128)), V(uintptr(128))}, 4004 {V(uintptr(129)), V(int64(129))}, 4005 {V(int64(130)), V(float32(130))}, 4006 {V(float32(131)), V(int64(131))}, 4007 {V(int64(132)), V(float64(132))}, 4008 {V(float64(133)), V(int64(133))}, 4009 {V(uint64(134)), V(uint64(134))}, 4010 {V(uint64(135)), V(int(135))}, 4011 {V(int(136)), V(uint64(136))}, 4012 {V(uint64(137)), V(uint(137))}, 4013 {V(uint(138)), V(uint64(138))}, 4014 {V(uint64(139)), V(uintptr(139))}, 4015 {V(uintptr(140)), V(uint64(140))}, 4016 {V(uint64(141)), V(float32(141))}, 4017 {V(float32(142)), V(uint64(142))}, 4018 {V(uint64(143)), V(float64(143))}, 4019 {V(float64(144)), V(uint64(144))}, 4020 {V(int(145)), V(int(145))}, 4021 {V(int(146)), V(uint(146))}, 4022 {V(uint(147)), V(int(147))}, 4023 {V(int(148)), V(uintptr(148))}, 4024 {V(uintptr(149)), V(int(149))}, 4025 {V(int(150)), V(float32(150))}, 4026 {V(float32(151)), V(int(151))}, 4027 {V(int(152)), V(float64(152))}, 4028 {V(float64(153)), V(int(153))}, 4029 {V(uint(154)), V(uint(154))}, 4030 {V(uint(155)), V(uintptr(155))}, 4031 {V(uintptr(156)), V(uint(156))}, 4032 {V(uint(157)), V(float32(157))}, 4033 {V(float32(158)), V(uint(158))}, 4034 {V(uint(159)), V(float64(159))}, 4035 {V(float64(160)), V(uint(160))}, 4036 {V(uintptr(161)), V(uintptr(161))}, 4037 {V(uintptr(162)), V(float32(162))}, 4038 {V(float32(163)), V(uintptr(163))}, 4039 {V(uintptr(164)), V(float64(164))}, 4040 {V(float64(165)), V(uintptr(165))}, 4041 {V(float32(166)), V(float32(166))}, 4042 {V(float32(167)), V(float64(167))}, 4043 {V(float64(168)), V(float32(168))}, 4044 {V(float64(169)), V(float64(169))}, 4045 4046 // truncation 4047 {V(float64(1.5)), V(int(1))}, 4048 4049 // complex 4050 {V(complex64(1i)), V(complex64(1i))}, 4051 {V(complex64(2i)), V(complex128(2i))}, 4052 {V(complex128(3i)), V(complex64(3i))}, 4053 {V(complex128(4i)), V(complex128(4i))}, 4054 4055 // string 4056 {V(string("hello")), V(string("hello"))}, 4057 {V(string("bytes1")), V([]byte("bytes1"))}, 4058 {V([]byte("bytes2")), V(string("bytes2"))}, 4059 {V([]byte("bytes3")), V([]byte("bytes3"))}, 4060 {V(string("runes♝")), V([]rune("runes♝"))}, 4061 {V([]rune("runes♕")), V(string("runes♕"))}, 4062 {V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))}, 4063 {V(int('a')), V(string("a"))}, 4064 {V(int8('a')), V(string("a"))}, 4065 {V(int16('a')), V(string("a"))}, 4066 {V(int32('a')), V(string("a"))}, 4067 {V(int64('a')), V(string("a"))}, 4068 {V(uint('a')), V(string("a"))}, 4069 {V(uint8('a')), V(string("a"))}, 4070 {V(uint16('a')), V(string("a"))}, 4071 {V(uint32('a')), V(string("a"))}, 4072 {V(uint64('a')), V(string("a"))}, 4073 {V(uintptr('a')), V(string("a"))}, 4074 {V(int(-1)), V(string("\uFFFD"))}, 4075 {V(int8(-2)), V(string("\uFFFD"))}, 4076 {V(int16(-3)), V(string("\uFFFD"))}, 4077 {V(int32(-4)), V(string("\uFFFD"))}, 4078 {V(int64(-5)), V(string("\uFFFD"))}, 4079 {V(int64(-1 << 32)), V(string("\uFFFD"))}, 4080 {V(int64(1 << 32)), V(string("\uFFFD"))}, 4081 {V(uint(0x110001)), V(string("\uFFFD"))}, 4082 {V(uint32(0x110002)), V(string("\uFFFD"))}, 4083 {V(uint64(0x110003)), V(string("\uFFFD"))}, 4084 {V(uint64(1 << 32)), V(string("\uFFFD"))}, 4085 {V(uintptr(0x110004)), V(string("\uFFFD"))}, 4086 4087 // named string 4088 {V(MyString("hello")), V(string("hello"))}, 4089 {V(string("hello")), V(MyString("hello"))}, 4090 {V(string("hello")), V(string("hello"))}, 4091 {V(MyString("hello")), V(MyString("hello"))}, 4092 {V(MyString("bytes1")), V([]byte("bytes1"))}, 4093 {V([]byte("bytes2")), V(MyString("bytes2"))}, 4094 {V([]byte("bytes3")), V([]byte("bytes3"))}, 4095 {V(MyString("runes♝")), V([]rune("runes♝"))}, 4096 {V([]rune("runes♕")), V(MyString("runes♕"))}, 4097 {V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))}, 4098 {V([]rune("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))}, 4099 {V(MyRunes("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))}, 4100 {V(int('a')), V(MyString("a"))}, 4101 {V(int8('a')), V(MyString("a"))}, 4102 {V(int16('a')), V(MyString("a"))}, 4103 {V(int32('a')), V(MyString("a"))}, 4104 {V(int64('a')), V(MyString("a"))}, 4105 {V(uint('a')), V(MyString("a"))}, 4106 {V(uint8('a')), V(MyString("a"))}, 4107 {V(uint16('a')), V(MyString("a"))}, 4108 {V(uint32('a')), V(MyString("a"))}, 4109 {V(uint64('a')), V(MyString("a"))}, 4110 {V(uintptr('a')), V(MyString("a"))}, 4111 {V(int(-1)), V(MyString("\uFFFD"))}, 4112 {V(int8(-2)), V(MyString("\uFFFD"))}, 4113 {V(int16(-3)), V(MyString("\uFFFD"))}, 4114 {V(int32(-4)), V(MyString("\uFFFD"))}, 4115 {V(int64(-5)), V(MyString("\uFFFD"))}, 4116 {V(uint(0x110001)), V(MyString("\uFFFD"))}, 4117 {V(uint32(0x110002)), V(MyString("\uFFFD"))}, 4118 {V(uint64(0x110003)), V(MyString("\uFFFD"))}, 4119 {V(uintptr(0x110004)), V(MyString("\uFFFD"))}, 4120 4121 // named []byte 4122 {V(string("bytes1")), V(MyBytes("bytes1"))}, 4123 {V(MyBytes("bytes2")), V(string("bytes2"))}, 4124 {V(MyBytes("bytes3")), V(MyBytes("bytes3"))}, 4125 {V(MyString("bytes1")), V(MyBytes("bytes1"))}, 4126 {V(MyBytes("bytes2")), V(MyString("bytes2"))}, 4127 4128 // named []rune 4129 {V(string("runes♝")), V(MyRunes("runes♝"))}, 4130 {V(MyRunes("runes♕")), V(string("runes♕"))}, 4131 {V(MyRunes("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))}, 4132 {V(MyString("runes♝")), V(MyRunes("runes♝"))}, 4133 {V(MyRunes("runes♕")), V(MyString("runes♕"))}, 4134 4135 // slice to array pointer 4136 {V([]byte(nil)), V((*[0]byte)(nil))}, 4137 {V([]byte{}), V(new([0]byte))}, 4138 {V([]byte{7}), V(&[1]byte{7})}, 4139 {V(MyBytes([]byte(nil))), V((*[0]byte)(nil))}, 4140 {V(MyBytes([]byte{})), V(new([0]byte))}, 4141 {V(MyBytes([]byte{9})), V(&[1]byte{9})}, 4142 {V([]byte(nil)), V(MyBytesArrayPtr0(nil))}, 4143 {V([]byte{}), V(MyBytesArrayPtr0(new([0]byte)))}, 4144 {V([]byte{1, 2, 3, 4}), V(MyBytesArrayPtr(&[4]byte{1, 2, 3, 4}))}, 4145 {V(MyBytes([]byte{})), V(MyBytesArrayPtr0(new([0]byte)))}, 4146 {V(MyBytes([]byte{5, 6, 7, 8})), V(MyBytesArrayPtr(&[4]byte{5, 6, 7, 8}))}, 4147 4148 {V([]byte(nil)), V((*MyBytesArray0)(nil))}, 4149 {V([]byte{}), V((*MyBytesArray0)(new([0]byte)))}, 4150 {V([]byte{1, 2, 3, 4}), V(&MyBytesArray{1, 2, 3, 4})}, 4151 {V(MyBytes([]byte(nil))), V((*MyBytesArray0)(nil))}, 4152 {V(MyBytes([]byte{})), V((*MyBytesArray0)(new([0]byte)))}, 4153 {V(MyBytes([]byte{5, 6, 7, 8})), V(&MyBytesArray{5, 6, 7, 8})}, 4154 {V(new([0]byte)), V(new(MyBytesArray0))}, 4155 {V(new(MyBytesArray0)), V(new([0]byte))}, 4156 {V(MyBytesArrayPtr0(nil)), V((*[0]byte)(nil))}, 4157 {V((*[0]byte)(nil)), V(MyBytesArrayPtr0(nil))}, 4158 4159 // named types and equal underlying types 4160 {V(new(int)), V(new(integer))}, 4161 {V(new(integer)), V(new(int))}, 4162 {V(Empty{}), V(struct{}{})}, 4163 {V(new(Empty)), V(new(struct{}))}, 4164 {V(struct{}{}), V(Empty{})}, 4165 {V(new(struct{})), V(new(Empty))}, 4166 {V(Empty{}), V(Empty{})}, 4167 {V(MyBytes{}), V([]byte{})}, 4168 {V([]byte{}), V(MyBytes{})}, 4169 {V((func())(nil)), V(MyFunc(nil))}, 4170 {V((MyFunc)(nil)), V((func())(nil))}, 4171 4172 // structs with different tags 4173 {V(struct { 4174 x int `some:"foo"` 4175 }{}), V(struct { 4176 x int `some:"bar"` 4177 }{})}, 4178 4179 {V(struct { 4180 x int `some:"bar"` 4181 }{}), V(struct { 4182 x int `some:"foo"` 4183 }{})}, 4184 4185 {V(MyStruct{}), V(struct { 4186 x int `some:"foo"` 4187 }{})}, 4188 4189 {V(struct { 4190 x int `some:"foo"` 4191 }{}), V(MyStruct{})}, 4192 4193 {V(MyStruct{}), V(struct { 4194 x int `some:"bar"` 4195 }{})}, 4196 4197 {V(struct { 4198 x int `some:"bar"` 4199 }{}), V(MyStruct{})}, 4200 4201 {V(MyStruct1{}), V(MyStruct2{})}, 4202 {V(MyStruct2{}), V(MyStruct1{})}, 4203 4204 // can convert *byte and *MyByte 4205 {V((*byte)(nil)), V((*MyByte)(nil))}, 4206 {V((*MyByte)(nil)), V((*byte)(nil))}, 4207 4208 // cannot convert mismatched array sizes 4209 {V([2]byte{}), V([2]byte{})}, 4210 {V([3]byte{}), V([3]byte{})}, 4211 4212 // cannot convert other instances 4213 {V((**byte)(nil)), V((**byte)(nil))}, 4214 {V((**MyByte)(nil)), V((**MyByte)(nil))}, 4215 {V((chan byte)(nil)), V((chan byte)(nil))}, 4216 {V((chan MyByte)(nil)), V((chan MyByte)(nil))}, 4217 {V(([]byte)(nil)), V(([]byte)(nil))}, 4218 {V(([]MyByte)(nil)), V(([]MyByte)(nil))}, 4219 {V((map[int]byte)(nil)), V((map[int]byte)(nil))}, 4220 {V((map[int]MyByte)(nil)), V((map[int]MyByte)(nil))}, 4221 {V((map[byte]int)(nil)), V((map[byte]int)(nil))}, 4222 {V((map[MyByte]int)(nil)), V((map[MyByte]int)(nil))}, 4223 {V([2]byte{}), V([2]byte{})}, 4224 {V([2]MyByte{}), V([2]MyByte{})}, 4225 4226 // other 4227 {V((***int)(nil)), V((***int)(nil))}, 4228 {V((***byte)(nil)), V((***byte)(nil))}, 4229 {V((***int32)(nil)), V((***int32)(nil))}, 4230 {V((***int64)(nil)), V((***int64)(nil))}, 4231 {V((chan byte)(nil)), V((chan byte)(nil))}, 4232 {V((chan MyByte)(nil)), V((chan MyByte)(nil))}, 4233 {V((map[int]bool)(nil)), V((map[int]bool)(nil))}, 4234 {V((map[int]byte)(nil)), V((map[int]byte)(nil))}, 4235 {V((map[uint]bool)(nil)), V((map[uint]bool)(nil))}, 4236 {V([]uint(nil)), V([]uint(nil))}, 4237 {V([]int(nil)), V([]int(nil))}, 4238 {V(new(interface{})), V(new(interface{}))}, 4239 {V(new(io.Reader)), V(new(io.Reader))}, 4240 {V(new(io.Writer)), V(new(io.Writer))}, 4241 4242 // channels 4243 {V(IntChan(nil)), V((chan<- int)(nil))}, 4244 {V(IntChan(nil)), V((<-chan int)(nil))}, 4245 {V((chan int)(nil)), V(IntChanRecv(nil))}, 4246 {V((chan int)(nil)), V(IntChanSend(nil))}, 4247 {V(IntChanRecv(nil)), V((<-chan int)(nil))}, 4248 {V((<-chan int)(nil)), V(IntChanRecv(nil))}, 4249 {V(IntChanSend(nil)), V((chan<- int)(nil))}, 4250 {V((chan<- int)(nil)), V(IntChanSend(nil))}, 4251 {V(IntChan(nil)), V((chan int)(nil))}, 4252 {V((chan int)(nil)), V(IntChan(nil))}, 4253 {V((chan int)(nil)), V((<-chan int)(nil))}, 4254 {V((chan int)(nil)), V((chan<- int)(nil))}, 4255 {V(BytesChan(nil)), V((chan<- []byte)(nil))}, 4256 {V(BytesChan(nil)), V((<-chan []byte)(nil))}, 4257 {V((chan []byte)(nil)), V(BytesChanRecv(nil))}, 4258 {V((chan []byte)(nil)), V(BytesChanSend(nil))}, 4259 {V(BytesChanRecv(nil)), V((<-chan []byte)(nil))}, 4260 {V((<-chan []byte)(nil)), V(BytesChanRecv(nil))}, 4261 {V(BytesChanSend(nil)), V((chan<- []byte)(nil))}, 4262 {V((chan<- []byte)(nil)), V(BytesChanSend(nil))}, 4263 {V(BytesChan(nil)), V((chan []byte)(nil))}, 4264 {V((chan []byte)(nil)), V(BytesChan(nil))}, 4265 {V((chan []byte)(nil)), V((<-chan []byte)(nil))}, 4266 {V((chan []byte)(nil)), V((chan<- []byte)(nil))}, 4267 4268 // cannot convert other instances (channels) 4269 {V(IntChan(nil)), V(IntChan(nil))}, 4270 {V(IntChanRecv(nil)), V(IntChanRecv(nil))}, 4271 {V(IntChanSend(nil)), V(IntChanSend(nil))}, 4272 {V(BytesChan(nil)), V(BytesChan(nil))}, 4273 {V(BytesChanRecv(nil)), V(BytesChanRecv(nil))}, 4274 {V(BytesChanSend(nil)), V(BytesChanSend(nil))}, 4275 4276 // interfaces 4277 {V(int(1)), EmptyInterfaceV(int(1))}, 4278 {V(string("hello")), EmptyInterfaceV(string("hello"))}, 4279 {V(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))}, 4280 {ReadWriterV(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))}, 4281 {V(new(bytes.Buffer)), ReadWriterV(new(bytes.Buffer))}, 4282 } 4283 4284 func TestConvert(t *testing.T) { 4285 canConvert := map[[2]Type]bool{} 4286 all := map[Type]bool{} 4287 4288 for _, tt := range convertTests { 4289 t1 := tt.in.Type() 4290 if !t1.ConvertibleTo(t1) { 4291 t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t1) 4292 continue 4293 } 4294 4295 t2 := tt.out.Type() 4296 if !t1.ConvertibleTo(t2) { 4297 t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t2) 4298 continue 4299 } 4300 4301 all[t1] = true 4302 all[t2] = true 4303 canConvert[[2]Type{t1, t2}] = true 4304 4305 // vout1 represents the in value converted to the in type. 4306 v1 := tt.in 4307 if !v1.CanConvert(t1) { 4308 t.Errorf("ValueOf(%T(%[1]v)).CanConvert(%s) = false, want true", tt.in.Interface(), t1) 4309 } 4310 vout1 := v1.Convert(t1) 4311 out1 := vout1.Interface() 4312 if vout1.Type() != tt.in.Type() || !DeepEqual(out1, tt.in.Interface()) { 4313 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t1, out1, tt.in.Interface()) 4314 } 4315 4316 // vout2 represents the in value converted to the out type. 4317 if !v1.CanConvert(t2) { 4318 t.Errorf("ValueOf(%T(%[1]v)).CanConvert(%s) = false, want true", tt.in.Interface(), t2) 4319 } 4320 vout2 := v1.Convert(t2) 4321 out2 := vout2.Interface() 4322 if vout2.Type() != tt.out.Type() || !DeepEqual(out2, tt.out.Interface()) { 4323 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out2, tt.out.Interface()) 4324 } 4325 if got, want := vout2.Kind(), vout2.Type().Kind(); got != want { 4326 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) has internal kind %v want %v", tt.in.Interface(), t1, got, want) 4327 } 4328 4329 // vout3 represents a new value of the out type, set to vout2. This makes 4330 // sure the converted value vout2 is really usable as a regular value. 4331 vout3 := New(t2).Elem() 4332 vout3.Set(vout2) 4333 out3 := vout3.Interface() 4334 if vout3.Type() != tt.out.Type() || !DeepEqual(out3, tt.out.Interface()) { 4335 t.Errorf("Set(ValueOf(%T(%[1]v)).Convert(%s)) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out3, tt.out.Interface()) 4336 } 4337 4338 if IsRO(v1) { 4339 t.Errorf("table entry %v is RO, should not be", v1) 4340 } 4341 if IsRO(vout1) { 4342 t.Errorf("self-conversion output %v is RO, should not be", vout1) 4343 } 4344 if IsRO(vout2) { 4345 t.Errorf("conversion output %v is RO, should not be", vout2) 4346 } 4347 if IsRO(vout3) { 4348 t.Errorf("set(conversion output) %v is RO, should not be", vout3) 4349 } 4350 if !IsRO(MakeRO(v1).Convert(t1)) { 4351 t.Errorf("RO self-conversion output %v is not RO, should be", v1) 4352 } 4353 if !IsRO(MakeRO(v1).Convert(t2)) { 4354 t.Errorf("RO conversion output %v is not RO, should be", v1) 4355 } 4356 } 4357 4358 // Assume that of all the types we saw during the tests, 4359 // if there wasn't an explicit entry for a conversion between 4360 // a pair of types, then it's not to be allowed. This checks for 4361 // things like 'int64' converting to '*int'. 4362 for t1 := range all { 4363 for t2 := range all { 4364 expectOK := t1 == t2 || canConvert[[2]Type{t1, t2}] || t2.Kind() == Interface && t2.NumMethod() == 0 4365 if ok := t1.ConvertibleTo(t2); ok != expectOK { 4366 t.Errorf("(%s).ConvertibleTo(%s) = %v, want %v", t1, t2, ok, expectOK) 4367 } 4368 } 4369 } 4370 } 4371 4372 func TestConvertPanic(t *testing.T) { 4373 s := make([]byte, 4) 4374 p := new([8]byte) 4375 v := ValueOf(s) 4376 pt := TypeOf(p) 4377 if !v.Type().ConvertibleTo(pt) { 4378 t.Errorf("[]byte should be convertible to *[8]byte") 4379 } 4380 if v.CanConvert(pt) { 4381 t.Errorf("slice with length 4 should not be convertible to *[8]byte") 4382 } 4383 shouldPanic("reflect: cannot convert slice with length 4 to pointer to array with length 8", func() { 4384 _ = v.Convert(pt) 4385 }) 4386 } 4387 4388 var gFloat32 float32 4389 4390 func TestConvertNaNs(t *testing.T) { 4391 const snan uint32 = 0x7f800001 4392 type myFloat32 float32 4393 x := V(myFloat32(math.Float32frombits(snan))) 4394 y := x.Convert(TypeOf(float32(0))) 4395 z := y.Interface().(float32) 4396 if got := math.Float32bits(z); got != snan { 4397 t.Errorf("signaling nan conversion got %x, want %x", got, snan) 4398 } 4399 } 4400 4401 type ComparableStruct struct { 4402 X int 4403 } 4404 4405 type NonComparableStruct struct { 4406 X int 4407 Y map[string]int 4408 } 4409 4410 var comparableTests = []struct { 4411 typ Type 4412 ok bool 4413 }{ 4414 {TypeOf(1), true}, 4415 {TypeOf("hello"), true}, 4416 {TypeOf(new(byte)), true}, 4417 {TypeOf((func())(nil)), false}, 4418 {TypeOf([]byte{}), false}, 4419 {TypeOf(map[string]int{}), false}, 4420 {TypeOf(make(chan int)), true}, 4421 {TypeOf(1.5), true}, 4422 {TypeOf(false), true}, 4423 {TypeOf(1i), true}, 4424 {TypeOf(ComparableStruct{}), true}, 4425 {TypeOf(NonComparableStruct{}), false}, 4426 {TypeOf([10]map[string]int{}), false}, 4427 {TypeOf([10]string{}), true}, 4428 {TypeOf(new(interface{})).Elem(), true}, 4429 } 4430 4431 func TestComparable(t *testing.T) { 4432 for _, tt := range comparableTests { 4433 if ok := tt.typ.Comparable(); ok != tt.ok { 4434 t.Errorf("TypeOf(%v).Comparable() = %v, want %v", tt.typ, ok, tt.ok) 4435 } 4436 } 4437 } 4438 4439 func TestOverflow(t *testing.T) { 4440 if ovf := V(float64(0)).OverflowFloat(1e300); ovf { 4441 t.Errorf("%v wrongly overflows float64", 1e300) 4442 } 4443 4444 maxFloat32 := float64((1<<24 - 1) << (127 - 23)) 4445 if ovf := V(float32(0)).OverflowFloat(maxFloat32); ovf { 4446 t.Errorf("%v wrongly overflows float32", maxFloat32) 4447 } 4448 ovfFloat32 := float64((1<<24-1)<<(127-23) + 1<<(127-52)) 4449 if ovf := V(float32(0)).OverflowFloat(ovfFloat32); !ovf { 4450 t.Errorf("%v should overflow float32", ovfFloat32) 4451 } 4452 if ovf := V(float32(0)).OverflowFloat(-ovfFloat32); !ovf { 4453 t.Errorf("%v should overflow float32", -ovfFloat32) 4454 } 4455 4456 maxInt32 := int64(0x7fffffff) 4457 if ovf := V(int32(0)).OverflowInt(maxInt32); ovf { 4458 t.Errorf("%v wrongly overflows int32", maxInt32) 4459 } 4460 if ovf := V(int32(0)).OverflowInt(-1 << 31); ovf { 4461 t.Errorf("%v wrongly overflows int32", -int64(1)<<31) 4462 } 4463 ovfInt32 := int64(1 << 31) 4464 if ovf := V(int32(0)).OverflowInt(ovfInt32); !ovf { 4465 t.Errorf("%v should overflow int32", ovfInt32) 4466 } 4467 4468 maxUint32 := uint64(0xffffffff) 4469 if ovf := V(uint32(0)).OverflowUint(maxUint32); ovf { 4470 t.Errorf("%v wrongly overflows uint32", maxUint32) 4471 } 4472 ovfUint32 := uint64(1 << 32) 4473 if ovf := V(uint32(0)).OverflowUint(ovfUint32); !ovf { 4474 t.Errorf("%v should overflow uint32", ovfUint32) 4475 } 4476 } 4477 4478 func checkSameType(t *testing.T, x Type, y interface{}) { 4479 if x != TypeOf(y) || TypeOf(Zero(x).Interface()) != TypeOf(y) { 4480 t.Errorf("did not find preexisting type for %s (vs %s)", TypeOf(x), TypeOf(y)) 4481 } 4482 } 4483 4484 func TestArrayOf(t *testing.T) { 4485 // check construction and use of type not in binary 4486 tests := []struct { 4487 n int 4488 value func(i int) interface{} 4489 comparable bool 4490 want string 4491 }{ 4492 { 4493 n: 0, 4494 value: func(i int) interface{} { type Tint int; return Tint(i) }, 4495 comparable: true, 4496 want: "[]", 4497 }, 4498 { 4499 n: 10, 4500 value: func(i int) interface{} { type Tint int; return Tint(i) }, 4501 comparable: true, 4502 want: "[0 1 2 3 4 5 6 7 8 9]", 4503 }, 4504 { 4505 n: 10, 4506 value: func(i int) interface{} { type Tfloat float64; return Tfloat(i) }, 4507 comparable: true, 4508 want: "[0 1 2 3 4 5 6 7 8 9]", 4509 }, 4510 { 4511 n: 10, 4512 value: func(i int) interface{} { type Tstring string; return Tstring(strconv.Itoa(i)) }, 4513 comparable: true, 4514 want: "[0 1 2 3 4 5 6 7 8 9]", 4515 }, 4516 { 4517 n: 10, 4518 value: func(i int) interface{} { type Tstruct struct{ V int }; return Tstruct{i} }, 4519 comparable: true, 4520 want: "[{0} {1} {2} {3} {4} {5} {6} {7} {8} {9}]", 4521 }, 4522 { 4523 n: 10, 4524 value: func(i int) interface{} { type Tint int; return []Tint{Tint(i)} }, 4525 comparable: false, 4526 want: "[[0] [1] [2] [3] [4] [5] [6] [7] [8] [9]]", 4527 }, 4528 { 4529 n: 10, 4530 value: func(i int) interface{} { type Tint int; return [1]Tint{Tint(i)} }, 4531 comparable: true, 4532 want: "[[0] [1] [2] [3] [4] [5] [6] [7] [8] [9]]", 4533 }, 4534 { 4535 n: 10, 4536 value: func(i int) interface{} { type Tstruct struct{ V [1]int }; return Tstruct{[1]int{i}} }, 4537 comparable: true, 4538 want: "[{[0]} {[1]} {[2]} {[3]} {[4]} {[5]} {[6]} {[7]} {[8]} {[9]}]", 4539 }, 4540 { 4541 n: 10, 4542 value: func(i int) interface{} { type Tstruct struct{ V []int }; return Tstruct{[]int{i}} }, 4543 comparable: false, 4544 want: "[{[0]} {[1]} {[2]} {[3]} {[4]} {[5]} {[6]} {[7]} {[8]} {[9]}]", 4545 }, 4546 { 4547 n: 10, 4548 value: func(i int) interface{} { type TstructUV struct{ U, V int }; return TstructUV{i, i} }, 4549 comparable: true, 4550 want: "[{0 0} {1 1} {2 2} {3 3} {4 4} {5 5} {6 6} {7 7} {8 8} {9 9}]", 4551 }, 4552 { 4553 n: 10, 4554 value: func(i int) interface{} { 4555 type TstructUV struct { 4556 U int 4557 V float64 4558 } 4559 return TstructUV{i, float64(i)} 4560 }, 4561 comparable: true, 4562 want: "[{0 0} {1 1} {2 2} {3 3} {4 4} {5 5} {6 6} {7 7} {8 8} {9 9}]", 4563 }, 4564 } 4565 4566 for _, table := range tests { 4567 at := ArrayOf(table.n, TypeOf(table.value(0))) 4568 v := New(at).Elem() 4569 vok := New(at).Elem() 4570 vnot := New(at).Elem() 4571 for i := 0; i < v.Len(); i++ { 4572 v.Index(i).Set(ValueOf(table.value(i))) 4573 vok.Index(i).Set(ValueOf(table.value(i))) 4574 j := i 4575 if i+1 == v.Len() { 4576 j = i + 1 4577 } 4578 vnot.Index(i).Set(ValueOf(table.value(j))) // make it differ only by last element 4579 } 4580 s := fmt.Sprint(v.Interface()) 4581 if s != table.want { 4582 t.Errorf("constructed array = %s, want %s", s, table.want) 4583 } 4584 4585 if table.comparable != at.Comparable() { 4586 t.Errorf("constructed array (%#v) is comparable=%v, want=%v", v.Interface(), at.Comparable(), table.comparable) 4587 } 4588 if table.comparable { 4589 if table.n > 0 { 4590 if DeepEqual(vnot.Interface(), v.Interface()) { 4591 t.Errorf( 4592 "arrays (%#v) compare ok (but should not)", 4593 v.Interface(), 4594 ) 4595 } 4596 } 4597 if !DeepEqual(vok.Interface(), v.Interface()) { 4598 t.Errorf( 4599 "arrays (%#v) compare NOT-ok (but should)", 4600 v.Interface(), 4601 ) 4602 } 4603 } 4604 } 4605 4606 // check that type already in binary is found 4607 type T int 4608 checkSameType(t, ArrayOf(5, TypeOf(T(1))), [5]T{}) 4609 } 4610 4611 func TestArrayOfGC(t *testing.T) { 4612 type T *uintptr 4613 tt := TypeOf(T(nil)) 4614 const n = 100 4615 var x []interface{} 4616 for i := 0; i < n; i++ { 4617 v := New(ArrayOf(n, tt)).Elem() 4618 for j := 0; j < v.Len(); j++ { 4619 p := new(uintptr) 4620 *p = uintptr(i*n + j) 4621 v.Index(j).Set(ValueOf(p).Convert(tt)) 4622 } 4623 x = append(x, v.Interface()) 4624 } 4625 runtime.GC() 4626 4627 for i, xi := range x { 4628 v := ValueOf(xi) 4629 for j := 0; j < v.Len(); j++ { 4630 k := v.Index(j).Elem().Interface() 4631 if k != uintptr(i*n+j) { 4632 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 4633 } 4634 } 4635 } 4636 } 4637 4638 func TestArrayOfAlg(t *testing.T) { 4639 at := ArrayOf(6, TypeOf(byte(0))) 4640 v1 := New(at).Elem() 4641 v2 := New(at).Elem() 4642 if v1.Interface() != v1.Interface() { 4643 t.Errorf("constructed array %v not equal to itself", v1.Interface()) 4644 } 4645 v1.Index(5).Set(ValueOf(byte(1))) 4646 if i1, i2 := v1.Interface(), v2.Interface(); i1 == i2 { 4647 t.Errorf("constructed arrays %v and %v should not be equal", i1, i2) 4648 } 4649 4650 at = ArrayOf(6, TypeOf([]int(nil))) 4651 v1 = New(at).Elem() 4652 shouldPanic("", func() { _ = v1.Interface() == v1.Interface() }) 4653 } 4654 4655 func TestArrayOfGenericAlg(t *testing.T) { 4656 at1 := ArrayOf(5, TypeOf(string(""))) 4657 at := ArrayOf(6, at1) 4658 v1 := New(at).Elem() 4659 v2 := New(at).Elem() 4660 if v1.Interface() != v1.Interface() { 4661 t.Errorf("constructed array %v not equal to itself", v1.Interface()) 4662 } 4663 4664 v1.Index(0).Index(0).Set(ValueOf("abc")) 4665 v2.Index(0).Index(0).Set(ValueOf("efg")) 4666 if i1, i2 := v1.Interface(), v2.Interface(); i1 == i2 { 4667 t.Errorf("constructed arrays %v and %v should not be equal", i1, i2) 4668 } 4669 4670 v1.Index(0).Index(0).Set(ValueOf("abc")) 4671 v2.Index(0).Index(0).Set(ValueOf((v1.Index(0).Index(0).String() + " ")[:3])) 4672 if i1, i2 := v1.Interface(), v2.Interface(); i1 != i2 { 4673 t.Errorf("constructed arrays %v and %v should be equal", i1, i2) 4674 } 4675 4676 // Test hash 4677 m := MakeMap(MapOf(at, TypeOf(int(0)))) 4678 m.SetMapIndex(v1, ValueOf(1)) 4679 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() { 4680 t.Errorf("constructed arrays %v and %v have different hashes", i1, i2) 4681 } 4682 } 4683 4684 func TestArrayOfDirectIface(t *testing.T) { 4685 { 4686 type T [1]*byte 4687 i1 := Zero(TypeOf(T{})).Interface() 4688 v1 := ValueOf(&i1).Elem() 4689 p1 := v1.InterfaceData()[1] 4690 4691 i2 := Zero(ArrayOf(1, PtrTo(TypeOf(int8(0))))).Interface() 4692 v2 := ValueOf(&i2).Elem() 4693 p2 := v2.InterfaceData()[1] 4694 4695 if p1 != 0 { 4696 t.Errorf("got p1=%v. want=%v", p1, nil) 4697 } 4698 4699 if p2 != 0 { 4700 t.Errorf("got p2=%v. want=%v", p2, nil) 4701 } 4702 } 4703 { 4704 type T [0]*byte 4705 i1 := Zero(TypeOf(T{})).Interface() 4706 v1 := ValueOf(&i1).Elem() 4707 p1 := v1.InterfaceData()[1] 4708 4709 i2 := Zero(ArrayOf(0, PtrTo(TypeOf(int8(0))))).Interface() 4710 v2 := ValueOf(&i2).Elem() 4711 p2 := v2.InterfaceData()[1] 4712 4713 if p1 == 0 { 4714 t.Errorf("got p1=%v. want=not-%v", p1, nil) 4715 } 4716 4717 if p2 == 0 { 4718 t.Errorf("got p2=%v. want=not-%v", p2, nil) 4719 } 4720 } 4721 } 4722 4723 // Ensure passing in negative lengths panics. 4724 // See https://golang.org/issue/43603 4725 func TestArrayOfPanicOnNegativeLength(t *testing.T) { 4726 shouldPanic("reflect: negative length passed to ArrayOf", func() { 4727 ArrayOf(-1, TypeOf(byte(0))) 4728 }) 4729 } 4730 4731 func TestSliceOf(t *testing.T) { 4732 // check construction and use of type not in binary 4733 type T int 4734 st := SliceOf(TypeOf(T(1))) 4735 if got, want := st.String(), "[]reflect_test.T"; got != want { 4736 t.Errorf("SliceOf(T(1)).String()=%q, want %q", got, want) 4737 } 4738 v := MakeSlice(st, 10, 10) 4739 runtime.GC() 4740 for i := 0; i < v.Len(); i++ { 4741 v.Index(i).Set(ValueOf(T(i))) 4742 runtime.GC() 4743 } 4744 s := fmt.Sprint(v.Interface()) 4745 want := "[0 1 2 3 4 5 6 7 8 9]" 4746 if s != want { 4747 t.Errorf("constructed slice = %s, want %s", s, want) 4748 } 4749 4750 // check that type already in binary is found 4751 type T1 int 4752 checkSameType(t, SliceOf(TypeOf(T1(1))), []T1{}) 4753 } 4754 4755 func TestSliceOverflow(t *testing.T) { 4756 // check that MakeSlice panics when size of slice overflows uint 4757 const S = 1e6 4758 s := uint(S) 4759 l := (1<<(unsafe.Sizeof((*byte)(nil))*8)-1)/s + 1 4760 if l*s >= s { 4761 t.Fatal("slice size does not overflow") 4762 } 4763 var x [S]byte 4764 st := SliceOf(TypeOf(x)) 4765 defer func() { 4766 err := recover() 4767 if err == nil { 4768 t.Fatal("slice overflow does not panic") 4769 } 4770 }() 4771 MakeSlice(st, int(l), int(l)) 4772 } 4773 4774 func TestSliceOfGC(t *testing.T) { 4775 type T *uintptr 4776 tt := TypeOf(T(nil)) 4777 st := SliceOf(tt) 4778 const n = 100 4779 var x []interface{} 4780 for i := 0; i < n; i++ { 4781 v := MakeSlice(st, n, n) 4782 for j := 0; j < v.Len(); j++ { 4783 p := new(uintptr) 4784 *p = uintptr(i*n + j) 4785 v.Index(j).Set(ValueOf(p).Convert(tt)) 4786 } 4787 x = append(x, v.Interface()) 4788 } 4789 runtime.GC() 4790 4791 for i, xi := range x { 4792 v := ValueOf(xi) 4793 for j := 0; j < v.Len(); j++ { 4794 k := v.Index(j).Elem().Interface() 4795 if k != uintptr(i*n+j) { 4796 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 4797 } 4798 } 4799 } 4800 } 4801 4802 func TestStructOfFieldName(t *testing.T) { 4803 // invalid field name "1nvalid" 4804 shouldPanic("has invalid name", func() { 4805 StructOf([]StructField{ 4806 {Name: "Valid", Type: TypeOf("")}, 4807 {Name: "1nvalid", Type: TypeOf("")}, 4808 }) 4809 }) 4810 4811 // invalid field name "+" 4812 shouldPanic("has invalid name", func() { 4813 StructOf([]StructField{ 4814 {Name: "Val1d", Type: TypeOf("")}, 4815 {Name: "+", Type: TypeOf("")}, 4816 }) 4817 }) 4818 4819 // no field name 4820 shouldPanic("has no name", func() { 4821 StructOf([]StructField{ 4822 {Name: "", Type: TypeOf("")}, 4823 }) 4824 }) 4825 4826 // verify creation of a struct with valid struct fields 4827 validFields := []StructField{ 4828 { 4829 Name: "φ", 4830 Type: TypeOf(""), 4831 }, 4832 { 4833 Name: "ValidName", 4834 Type: TypeOf(""), 4835 }, 4836 { 4837 Name: "Val1dNam5", 4838 Type: TypeOf(""), 4839 }, 4840 } 4841 4842 validStruct := StructOf(validFields) 4843 4844 const structStr = `struct { φ string; ValidName string; Val1dNam5 string }` 4845 if got, want := validStruct.String(), structStr; got != want { 4846 t.Errorf("StructOf(validFields).String()=%q, want %q", got, want) 4847 } 4848 } 4849 4850 func TestStructOf(t *testing.T) { 4851 // check construction and use of type not in binary 4852 fields := []StructField{ 4853 { 4854 Name: "S", 4855 Tag: "s", 4856 Type: TypeOf(""), 4857 }, 4858 { 4859 Name: "X", 4860 Tag: "x", 4861 Type: TypeOf(byte(0)), 4862 }, 4863 { 4864 Name: "Y", 4865 Type: TypeOf(uint64(0)), 4866 }, 4867 { 4868 Name: "Z", 4869 Type: TypeOf([3]uint16{}), 4870 }, 4871 } 4872 4873 st := StructOf(fields) 4874 v := New(st).Elem() 4875 runtime.GC() 4876 v.FieldByName("X").Set(ValueOf(byte(2))) 4877 v.FieldByIndex([]int{1}).Set(ValueOf(byte(1))) 4878 runtime.GC() 4879 4880 s := fmt.Sprint(v.Interface()) 4881 want := `{ 1 0 [0 0 0]}` 4882 if s != want { 4883 t.Errorf("constructed struct = %s, want %s", s, want) 4884 } 4885 const stStr = `struct { S string "s"; X uint8 "x"; Y uint64; Z [3]uint16 }` 4886 if got, want := st.String(), stStr; got != want { 4887 t.Errorf("StructOf(fields).String()=%q, want %q", got, want) 4888 } 4889 4890 // check the size, alignment and field offsets 4891 stt := TypeOf(struct { 4892 String string 4893 X byte 4894 Y uint64 4895 Z [3]uint16 4896 }{}) 4897 if st.Size() != stt.Size() { 4898 t.Errorf("constructed struct size = %v, want %v", st.Size(), stt.Size()) 4899 } 4900 if st.Align() != stt.Align() { 4901 t.Errorf("constructed struct align = %v, want %v", st.Align(), stt.Align()) 4902 } 4903 if st.FieldAlign() != stt.FieldAlign() { 4904 t.Errorf("constructed struct field align = %v, want %v", st.FieldAlign(), stt.FieldAlign()) 4905 } 4906 for i := 0; i < st.NumField(); i++ { 4907 o1 := st.Field(i).Offset 4908 o2 := stt.Field(i).Offset 4909 if o1 != o2 { 4910 t.Errorf("constructed struct field %v offset = %v, want %v", i, o1, o2) 4911 } 4912 } 4913 4914 // Check size and alignment with a trailing zero-sized field. 4915 st = StructOf([]StructField{ 4916 { 4917 Name: "F1", 4918 Type: TypeOf(byte(0)), 4919 }, 4920 { 4921 Name: "F2", 4922 Type: TypeOf([0]*byte{}), 4923 }, 4924 }) 4925 stt = TypeOf(struct { 4926 G1 byte 4927 G2 [0]*byte 4928 }{}) 4929 if st.Size() != stt.Size() { 4930 t.Errorf("constructed zero-padded struct size = %v, want %v", st.Size(), stt.Size()) 4931 } 4932 if st.Align() != stt.Align() { 4933 t.Errorf("constructed zero-padded struct align = %v, want %v", st.Align(), stt.Align()) 4934 } 4935 if st.FieldAlign() != stt.FieldAlign() { 4936 t.Errorf("constructed zero-padded struct field align = %v, want %v", st.FieldAlign(), stt.FieldAlign()) 4937 } 4938 for i := 0; i < st.NumField(); i++ { 4939 o1 := st.Field(i).Offset 4940 o2 := stt.Field(i).Offset 4941 if o1 != o2 { 4942 t.Errorf("constructed zero-padded struct field %v offset = %v, want %v", i, o1, o2) 4943 } 4944 } 4945 4946 // check duplicate names 4947 shouldPanic("duplicate field", func() { 4948 StructOf([]StructField{ 4949 {Name: "string", PkgPath: "p", Type: TypeOf("")}, 4950 {Name: "string", PkgPath: "p", Type: TypeOf("")}, 4951 }) 4952 }) 4953 shouldPanic("has no name", func() { 4954 StructOf([]StructField{ 4955 {Type: TypeOf("")}, 4956 {Name: "string", PkgPath: "p", Type: TypeOf("")}, 4957 }) 4958 }) 4959 shouldPanic("has no name", func() { 4960 StructOf([]StructField{ 4961 {Type: TypeOf("")}, 4962 {Type: TypeOf("")}, 4963 }) 4964 }) 4965 // check that type already in binary is found 4966 checkSameType(t, StructOf(fields[2:3]), struct{ Y uint64 }{}) 4967 4968 // gccgo used to fail this test. 4969 type structFieldType interface{} 4970 checkSameType(t, 4971 StructOf([]StructField{ 4972 { 4973 Name: "F", 4974 Type: TypeOf((*structFieldType)(nil)).Elem(), 4975 }, 4976 }), 4977 struct{ F structFieldType }{}) 4978 } 4979 4980 func TestStructOfExportRules(t *testing.T) { 4981 type S1 struct{} 4982 type s2 struct{} 4983 type ΦType struct{} 4984 type φType struct{} 4985 4986 testPanic := func(i int, mustPanic bool, f func()) { 4987 defer func() { 4988 err := recover() 4989 if err == nil && mustPanic { 4990 t.Errorf("test-%d did not panic", i) 4991 } 4992 if err != nil && !mustPanic { 4993 t.Errorf("test-%d panicked: %v\n", i, err) 4994 } 4995 }() 4996 f() 4997 } 4998 4999 tests := []struct { 5000 field StructField 5001 mustPanic bool 5002 exported bool 5003 }{ 5004 { 5005 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf(S1{})}, 5006 exported: true, 5007 }, 5008 { 5009 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf((*S1)(nil))}, 5010 exported: true, 5011 }, 5012 { 5013 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf(s2{})}, 5014 mustPanic: true, 5015 }, 5016 { 5017 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf((*s2)(nil))}, 5018 mustPanic: true, 5019 }, 5020 { 5021 field: StructField{Name: "Name", Type: nil, PkgPath: ""}, 5022 mustPanic: true, 5023 }, 5024 { 5025 field: StructField{Name: "", Type: TypeOf(S1{}), PkgPath: ""}, 5026 mustPanic: true, 5027 }, 5028 { 5029 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf(S1{}), PkgPath: "other/pkg"}, 5030 mustPanic: true, 5031 }, 5032 { 5033 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf((*S1)(nil)), PkgPath: "other/pkg"}, 5034 mustPanic: true, 5035 }, 5036 { 5037 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf(s2{}), PkgPath: "other/pkg"}, 5038 mustPanic: true, 5039 }, 5040 { 5041 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf((*s2)(nil)), PkgPath: "other/pkg"}, 5042 mustPanic: true, 5043 }, 5044 { 5045 field: StructField{Name: "s2", Type: TypeOf(int(0)), PkgPath: "other/pkg"}, 5046 }, 5047 { 5048 field: StructField{Name: "s2", Type: TypeOf(int(0)), PkgPath: "other/pkg"}, 5049 }, 5050 { 5051 field: StructField{Name: "S", Type: TypeOf(S1{})}, 5052 exported: true, 5053 }, 5054 { 5055 field: StructField{Name: "S", Type: TypeOf((*S1)(nil))}, 5056 exported: true, 5057 }, 5058 { 5059 field: StructField{Name: "S", Type: TypeOf(s2{})}, 5060 exported: true, 5061 }, 5062 { 5063 field: StructField{Name: "S", Type: TypeOf((*s2)(nil))}, 5064 exported: true, 5065 }, 5066 { 5067 field: StructField{Name: "s", Type: TypeOf(S1{})}, 5068 mustPanic: true, 5069 }, 5070 { 5071 field: StructField{Name: "s", Type: TypeOf((*S1)(nil))}, 5072 mustPanic: true, 5073 }, 5074 { 5075 field: StructField{Name: "s", Type: TypeOf(s2{})}, 5076 mustPanic: true, 5077 }, 5078 { 5079 field: StructField{Name: "s", Type: TypeOf((*s2)(nil))}, 5080 mustPanic: true, 5081 }, 5082 { 5083 field: StructField{Name: "s", Type: TypeOf(S1{}), PkgPath: "other/pkg"}, 5084 }, 5085 { 5086 field: StructField{Name: "s", Type: TypeOf((*S1)(nil)), PkgPath: "other/pkg"}, 5087 }, 5088 { 5089 field: StructField{Name: "s", Type: TypeOf(s2{}), PkgPath: "other/pkg"}, 5090 }, 5091 { 5092 field: StructField{Name: "s", Type: TypeOf((*s2)(nil)), PkgPath: "other/pkg"}, 5093 }, 5094 { 5095 field: StructField{Name: "", Type: TypeOf(ΦType{})}, 5096 mustPanic: true, 5097 }, 5098 { 5099 field: StructField{Name: "", Type: TypeOf(φType{})}, 5100 mustPanic: true, 5101 }, 5102 { 5103 field: StructField{Name: "Φ", Type: TypeOf(0)}, 5104 exported: true, 5105 }, 5106 { 5107 field: StructField{Name: "φ", Type: TypeOf(0)}, 5108 exported: false, 5109 }, 5110 } 5111 5112 for i, test := range tests { 5113 testPanic(i, test.mustPanic, func() { 5114 typ := StructOf([]StructField{test.field}) 5115 if typ == nil { 5116 t.Errorf("test-%d: error creating struct type", i) 5117 return 5118 } 5119 field := typ.Field(0) 5120 n := field.Name 5121 if n == "" { 5122 panic("field.Name must not be empty") 5123 } 5124 exported := token.IsExported(n) 5125 if exported != test.exported { 5126 t.Errorf("test-%d: got exported=%v want exported=%v", i, exported, test.exported) 5127 } 5128 if field.PkgPath != test.field.PkgPath { 5129 t.Errorf("test-%d: got PkgPath=%q want pkgPath=%q", i, field.PkgPath, test.field.PkgPath) 5130 } 5131 }) 5132 } 5133 } 5134 5135 func TestStructOfGC(t *testing.T) { 5136 type T *uintptr 5137 tt := TypeOf(T(nil)) 5138 fields := []StructField{ 5139 {Name: "X", Type: tt}, 5140 {Name: "Y", Type: tt}, 5141 } 5142 st := StructOf(fields) 5143 5144 const n = 10000 5145 var x []interface{} 5146 for i := 0; i < n; i++ { 5147 v := New(st).Elem() 5148 for j := 0; j < v.NumField(); j++ { 5149 p := new(uintptr) 5150 *p = uintptr(i*n + j) 5151 v.Field(j).Set(ValueOf(p).Convert(tt)) 5152 } 5153 x = append(x, v.Interface()) 5154 } 5155 runtime.GC() 5156 5157 for i, xi := range x { 5158 v := ValueOf(xi) 5159 for j := 0; j < v.NumField(); j++ { 5160 k := v.Field(j).Elem().Interface() 5161 if k != uintptr(i*n+j) { 5162 t.Errorf("lost x[%d].%c = %d, want %d", i, "XY"[j], k, i*n+j) 5163 } 5164 } 5165 } 5166 } 5167 5168 func TestStructOfAlg(t *testing.T) { 5169 st := StructOf([]StructField{{Name: "X", Tag: "x", Type: TypeOf(int(0))}}) 5170 v1 := New(st).Elem() 5171 v2 := New(st).Elem() 5172 if !DeepEqual(v1.Interface(), v1.Interface()) { 5173 t.Errorf("constructed struct %v not equal to itself", v1.Interface()) 5174 } 5175 v1.FieldByName("X").Set(ValueOf(int(1))) 5176 if i1, i2 := v1.Interface(), v2.Interface(); DeepEqual(i1, i2) { 5177 t.Errorf("constructed structs %v and %v should not be equal", i1, i2) 5178 } 5179 5180 st = StructOf([]StructField{{Name: "X", Tag: "x", Type: TypeOf([]int(nil))}}) 5181 v1 = New(st).Elem() 5182 shouldPanic("", func() { _ = v1.Interface() == v1.Interface() }) 5183 } 5184 5185 func TestStructOfGenericAlg(t *testing.T) { 5186 st1 := StructOf([]StructField{ 5187 {Name: "X", Tag: "x", Type: TypeOf(int64(0))}, 5188 {Name: "Y", Type: TypeOf(string(""))}, 5189 }) 5190 st := StructOf([]StructField{ 5191 {Name: "S0", Type: st1}, 5192 {Name: "S1", Type: st1}, 5193 }) 5194 5195 tests := []struct { 5196 rt Type 5197 idx []int 5198 }{ 5199 { 5200 rt: st, 5201 idx: []int{0, 1}, 5202 }, 5203 { 5204 rt: st1, 5205 idx: []int{1}, 5206 }, 5207 { 5208 rt: StructOf( 5209 []StructField{ 5210 {Name: "XX", Type: TypeOf([0]int{})}, 5211 {Name: "YY", Type: TypeOf("")}, 5212 }, 5213 ), 5214 idx: []int{1}, 5215 }, 5216 { 5217 rt: StructOf( 5218 []StructField{ 5219 {Name: "XX", Type: TypeOf([0]int{})}, 5220 {Name: "YY", Type: TypeOf("")}, 5221 {Name: "ZZ", Type: TypeOf([2]int{})}, 5222 }, 5223 ), 5224 idx: []int{1}, 5225 }, 5226 { 5227 rt: StructOf( 5228 []StructField{ 5229 {Name: "XX", Type: TypeOf([1]int{})}, 5230 {Name: "YY", Type: TypeOf("")}, 5231 }, 5232 ), 5233 idx: []int{1}, 5234 }, 5235 { 5236 rt: StructOf( 5237 []StructField{ 5238 {Name: "XX", Type: TypeOf([1]int{})}, 5239 {Name: "YY", Type: TypeOf("")}, 5240 {Name: "ZZ", Type: TypeOf([1]int{})}, 5241 }, 5242 ), 5243 idx: []int{1}, 5244 }, 5245 { 5246 rt: StructOf( 5247 []StructField{ 5248 {Name: "XX", Type: TypeOf([2]int{})}, 5249 {Name: "YY", Type: TypeOf("")}, 5250 {Name: "ZZ", Type: TypeOf([2]int{})}, 5251 }, 5252 ), 5253 idx: []int{1}, 5254 }, 5255 { 5256 rt: StructOf( 5257 []StructField{ 5258 {Name: "XX", Type: TypeOf(int64(0))}, 5259 {Name: "YY", Type: TypeOf(byte(0))}, 5260 {Name: "ZZ", Type: TypeOf("")}, 5261 }, 5262 ), 5263 idx: []int{2}, 5264 }, 5265 { 5266 rt: StructOf( 5267 []StructField{ 5268 {Name: "XX", Type: TypeOf(int64(0))}, 5269 {Name: "YY", Type: TypeOf(int64(0))}, 5270 {Name: "ZZ", Type: TypeOf("")}, 5271 {Name: "AA", Type: TypeOf([1]int64{})}, 5272 }, 5273 ), 5274 idx: []int{2}, 5275 }, 5276 } 5277 5278 for _, table := range tests { 5279 v1 := New(table.rt).Elem() 5280 v2 := New(table.rt).Elem() 5281 5282 if !DeepEqual(v1.Interface(), v1.Interface()) { 5283 t.Errorf("constructed struct %v not equal to itself", v1.Interface()) 5284 } 5285 5286 v1.FieldByIndex(table.idx).Set(ValueOf("abc")) 5287 v2.FieldByIndex(table.idx).Set(ValueOf("def")) 5288 if i1, i2 := v1.Interface(), v2.Interface(); DeepEqual(i1, i2) { 5289 t.Errorf("constructed structs %v and %v should not be equal", i1, i2) 5290 } 5291 5292 abc := "abc" 5293 v1.FieldByIndex(table.idx).Set(ValueOf(abc)) 5294 val := "+" + abc + "-" 5295 v2.FieldByIndex(table.idx).Set(ValueOf(val[1:4])) 5296 if i1, i2 := v1.Interface(), v2.Interface(); !DeepEqual(i1, i2) { 5297 t.Errorf("constructed structs %v and %v should be equal", i1, i2) 5298 } 5299 5300 // Test hash 5301 m := MakeMap(MapOf(table.rt, TypeOf(int(0)))) 5302 m.SetMapIndex(v1, ValueOf(1)) 5303 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() { 5304 t.Errorf("constructed structs %#v and %#v have different hashes", i1, i2) 5305 } 5306 5307 v2.FieldByIndex(table.idx).Set(ValueOf("abc")) 5308 if i1, i2 := v1.Interface(), v2.Interface(); !DeepEqual(i1, i2) { 5309 t.Errorf("constructed structs %v and %v should be equal", i1, i2) 5310 } 5311 5312 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() { 5313 t.Errorf("constructed structs %v and %v have different hashes", i1, i2) 5314 } 5315 } 5316 } 5317 5318 func TestStructOfDirectIface(t *testing.T) { 5319 { 5320 type T struct{ X [1]*byte } 5321 i1 := Zero(TypeOf(T{})).Interface() 5322 v1 := ValueOf(&i1).Elem() 5323 p1 := v1.InterfaceData()[1] 5324 5325 i2 := Zero(StructOf([]StructField{ 5326 { 5327 Name: "X", 5328 Type: ArrayOf(1, TypeOf((*int8)(nil))), 5329 }, 5330 })).Interface() 5331 v2 := ValueOf(&i2).Elem() 5332 p2 := v2.InterfaceData()[1] 5333 5334 if p1 != 0 { 5335 t.Errorf("got p1=%v. want=%v", p1, nil) 5336 } 5337 5338 if p2 != 0 { 5339 t.Errorf("got p2=%v. want=%v", p2, nil) 5340 } 5341 } 5342 { 5343 type T struct{ X [0]*byte } 5344 i1 := Zero(TypeOf(T{})).Interface() 5345 v1 := ValueOf(&i1).Elem() 5346 p1 := v1.InterfaceData()[1] 5347 5348 i2 := Zero(StructOf([]StructField{ 5349 { 5350 Name: "X", 5351 Type: ArrayOf(0, TypeOf((*int8)(nil))), 5352 }, 5353 })).Interface() 5354 v2 := ValueOf(&i2).Elem() 5355 p2 := v2.InterfaceData()[1] 5356 5357 if p1 == 0 { 5358 t.Errorf("got p1=%v. want=not-%v", p1, nil) 5359 } 5360 5361 if p2 == 0 { 5362 t.Errorf("got p2=%v. want=not-%v", p2, nil) 5363 } 5364 } 5365 } 5366 5367 type StructI int 5368 5369 func (i StructI) Get() int { return int(i) } 5370 5371 type StructIPtr int 5372 5373 func (i *StructIPtr) Get() int { return int(*i) } 5374 func (i *StructIPtr) Set(v int) { *(*int)(i) = v } 5375 5376 type SettableStruct struct { 5377 SettableField int 5378 } 5379 5380 func (p *SettableStruct) Set(v int) { p.SettableField = v } 5381 5382 type SettablePointer struct { 5383 SettableField *int 5384 } 5385 5386 func (p *SettablePointer) Set(v int) { *p.SettableField = v } 5387 5388 func TestStructOfWithInterface(t *testing.T) { 5389 const want = 42 5390 type Iface interface { 5391 Get() int 5392 } 5393 type IfaceSet interface { 5394 Set(int) 5395 } 5396 tests := []struct { 5397 name string 5398 typ Type 5399 val Value 5400 impl bool 5401 }{ 5402 { 5403 name: "StructI", 5404 typ: TypeOf(StructI(want)), 5405 val: ValueOf(StructI(want)), 5406 impl: true, 5407 }, 5408 { 5409 name: "StructI", 5410 typ: PtrTo(TypeOf(StructI(want))), 5411 val: ValueOf(func() interface{} { 5412 v := StructI(want) 5413 return &v 5414 }()), 5415 impl: true, 5416 }, 5417 { 5418 name: "StructIPtr", 5419 typ: PtrTo(TypeOf(StructIPtr(want))), 5420 val: ValueOf(func() interface{} { 5421 v := StructIPtr(want) 5422 return &v 5423 }()), 5424 impl: true, 5425 }, 5426 { 5427 name: "StructIPtr", 5428 typ: TypeOf(StructIPtr(want)), 5429 val: ValueOf(StructIPtr(want)), 5430 impl: false, 5431 }, 5432 // { 5433 // typ: TypeOf((*Iface)(nil)).Elem(), // FIXME(sbinet): fix method.ifn/tfn 5434 // val: ValueOf(StructI(want)), 5435 // impl: true, 5436 // }, 5437 } 5438 5439 for i, table := range tests { 5440 for j := 0; j < 2; j++ { 5441 var fields []StructField 5442 if j == 1 { 5443 fields = append(fields, StructField{ 5444 Name: "Dummy", 5445 PkgPath: "", 5446 Type: TypeOf(int(0)), 5447 }) 5448 } 5449 fields = append(fields, StructField{ 5450 Name: table.name, 5451 Anonymous: true, 5452 PkgPath: "", 5453 Type: table.typ, 5454 }) 5455 5456 // We currently do not correctly implement methods 5457 // for embedded fields other than the first. 5458 // Therefore, for now, we expect those methods 5459 // to not exist. See issues 15924 and 20824. 5460 // When those issues are fixed, this test of panic 5461 // should be removed. 5462 if j == 1 && table.impl { 5463 func() { 5464 defer func() { 5465 if err := recover(); err == nil { 5466 t.Errorf("test-%d-%d did not panic", i, j) 5467 } 5468 }() 5469 _ = StructOf(fields) 5470 }() 5471 continue 5472 } 5473 5474 rt := StructOf(fields) 5475 rv := New(rt).Elem() 5476 rv.Field(j).Set(table.val) 5477 5478 if _, ok := rv.Interface().(Iface); ok != table.impl { 5479 if table.impl { 5480 t.Errorf("test-%d-%d: type=%v fails to implement Iface.\n", i, j, table.typ) 5481 } else { 5482 t.Errorf("test-%d-%d: type=%v should NOT implement Iface\n", i, j, table.typ) 5483 } 5484 continue 5485 } 5486 5487 if !table.impl { 5488 continue 5489 } 5490 5491 v := rv.Interface().(Iface).Get() 5492 if v != want { 5493 t.Errorf("test-%d-%d: x.Get()=%v. want=%v\n", i, j, v, want) 5494 } 5495 5496 fct := rv.MethodByName("Get") 5497 out := fct.Call(nil) 5498 if !DeepEqual(out[0].Interface(), want) { 5499 t.Errorf("test-%d-%d: x.Get()=%v. want=%v\n", i, j, out[0].Interface(), want) 5500 } 5501 } 5502 } 5503 5504 // Test an embedded nil pointer with pointer methods. 5505 fields := []StructField{{ 5506 Name: "StructIPtr", 5507 Anonymous: true, 5508 Type: PtrTo(TypeOf(StructIPtr(want))), 5509 }} 5510 rt := StructOf(fields) 5511 rv := New(rt).Elem() 5512 // This should panic since the pointer is nil. 5513 shouldPanic("", func() { 5514 rv.Interface().(IfaceSet).Set(want) 5515 }) 5516 5517 // Test an embedded nil pointer to a struct with pointer methods. 5518 5519 fields = []StructField{{ 5520 Name: "SettableStruct", 5521 Anonymous: true, 5522 Type: PtrTo(TypeOf(SettableStruct{})), 5523 }} 5524 rt = StructOf(fields) 5525 rv = New(rt).Elem() 5526 // This should panic since the pointer is nil. 5527 shouldPanic("", func() { 5528 rv.Interface().(IfaceSet).Set(want) 5529 }) 5530 5531 // The behavior is different if there is a second field, 5532 // since now an interface value holds a pointer to the struct 5533 // rather than just holding a copy of the struct. 5534 fields = []StructField{ 5535 { 5536 Name: "SettableStruct", 5537 Anonymous: true, 5538 Type: PtrTo(TypeOf(SettableStruct{})), 5539 }, 5540 { 5541 Name: "EmptyStruct", 5542 Anonymous: true, 5543 Type: StructOf(nil), 5544 }, 5545 } 5546 // With the current implementation this is expected to panic. 5547 // Ideally it should work and we should be able to see a panic 5548 // if we call the Set method. 5549 shouldPanic("", func() { 5550 StructOf(fields) 5551 }) 5552 5553 // Embed a field that can be stored directly in an interface, 5554 // with a second field. 5555 fields = []StructField{ 5556 { 5557 Name: "SettablePointer", 5558 Anonymous: true, 5559 Type: TypeOf(SettablePointer{}), 5560 }, 5561 { 5562 Name: "EmptyStruct", 5563 Anonymous: true, 5564 Type: StructOf(nil), 5565 }, 5566 } 5567 // With the current implementation this is expected to panic. 5568 // Ideally it should work and we should be able to call the 5569 // Set and Get methods. 5570 shouldPanic("", func() { 5571 StructOf(fields) 5572 }) 5573 } 5574 5575 func TestStructOfTooManyFields(t *testing.T) { 5576 // Bug Fix: #25402 - this should not panic 5577 tt := StructOf([]StructField{ 5578 {Name: "Time", Type: TypeOf(time.Time{}), Anonymous: true}, 5579 }) 5580 5581 if _, present := tt.MethodByName("After"); !present { 5582 t.Errorf("Expected method `After` to be found") 5583 } 5584 } 5585 5586 func TestStructOfDifferentPkgPath(t *testing.T) { 5587 fields := []StructField{ 5588 { 5589 Name: "f1", 5590 PkgPath: "p1", 5591 Type: TypeOf(int(0)), 5592 }, 5593 { 5594 Name: "f2", 5595 PkgPath: "p2", 5596 Type: TypeOf(int(0)), 5597 }, 5598 } 5599 shouldPanic("different PkgPath", func() { 5600 StructOf(fields) 5601 }) 5602 } 5603 5604 func TestChanOf(t *testing.T) { 5605 // check construction and use of type not in binary 5606 type T string 5607 ct := ChanOf(BothDir, TypeOf(T(""))) 5608 v := MakeChan(ct, 2) 5609 runtime.GC() 5610 v.Send(ValueOf(T("hello"))) 5611 runtime.GC() 5612 v.Send(ValueOf(T("world"))) 5613 runtime.GC() 5614 5615 sv1, _ := v.Recv() 5616 sv2, _ := v.Recv() 5617 s1 := sv1.String() 5618 s2 := sv2.String() 5619 if s1 != "hello" || s2 != "world" { 5620 t.Errorf("constructed chan: have %q, %q, want %q, %q", s1, s2, "hello", "world") 5621 } 5622 5623 // check that type already in binary is found 5624 type T1 int 5625 checkSameType(t, ChanOf(BothDir, TypeOf(T1(1))), (chan T1)(nil)) 5626 5627 // Check arrow token association in undefined chan types. 5628 var left chan<- chan T 5629 var right chan (<-chan T) 5630 tLeft := ChanOf(SendDir, ChanOf(BothDir, TypeOf(T("")))) 5631 tRight := ChanOf(BothDir, ChanOf(RecvDir, TypeOf(T("")))) 5632 if tLeft != TypeOf(left) { 5633 t.Errorf("chan<-chan: have %s, want %T", tLeft, left) 5634 } 5635 if tRight != TypeOf(right) { 5636 t.Errorf("chan<-chan: have %s, want %T", tRight, right) 5637 } 5638 } 5639 5640 func TestChanOfDir(t *testing.T) { 5641 // check construction and use of type not in binary 5642 type T string 5643 crt := ChanOf(RecvDir, TypeOf(T(""))) 5644 cst := ChanOf(SendDir, TypeOf(T(""))) 5645 5646 // check that type already in binary is found 5647 type T1 int 5648 checkSameType(t, ChanOf(RecvDir, TypeOf(T1(1))), (<-chan T1)(nil)) 5649 checkSameType(t, ChanOf(SendDir, TypeOf(T1(1))), (chan<- T1)(nil)) 5650 5651 // check String form of ChanDir 5652 if crt.ChanDir().String() != "<-chan" { 5653 t.Errorf("chan dir: have %q, want %q", crt.ChanDir().String(), "<-chan") 5654 } 5655 if cst.ChanDir().String() != "chan<-" { 5656 t.Errorf("chan dir: have %q, want %q", cst.ChanDir().String(), "chan<-") 5657 } 5658 } 5659 5660 func TestChanOfGC(t *testing.T) { 5661 done := make(chan bool, 1) 5662 go func() { 5663 select { 5664 case <-done: 5665 case <-time.After(5 * time.Second): 5666 panic("deadlock in TestChanOfGC") 5667 } 5668 }() 5669 5670 defer func() { 5671 done <- true 5672 }() 5673 5674 type T *uintptr 5675 tt := TypeOf(T(nil)) 5676 ct := ChanOf(BothDir, tt) 5677 5678 // NOTE: The garbage collector handles allocated channels specially, 5679 // so we have to save pointers to channels in x; the pointer code will 5680 // use the gc info in the newly constructed chan type. 5681 const n = 100 5682 var x []interface{} 5683 for i := 0; i < n; i++ { 5684 v := MakeChan(ct, n) 5685 for j := 0; j < n; j++ { 5686 p := new(uintptr) 5687 *p = uintptr(i*n + j) 5688 v.Send(ValueOf(p).Convert(tt)) 5689 } 5690 pv := New(ct) 5691 pv.Elem().Set(v) 5692 x = append(x, pv.Interface()) 5693 } 5694 runtime.GC() 5695 5696 for i, xi := range x { 5697 v := ValueOf(xi).Elem() 5698 for j := 0; j < n; j++ { 5699 pv, _ := v.Recv() 5700 k := pv.Elem().Interface() 5701 if k != uintptr(i*n+j) { 5702 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 5703 } 5704 } 5705 } 5706 } 5707 5708 func TestMapOf(t *testing.T) { 5709 // check construction and use of type not in binary 5710 type K string 5711 type V float64 5712 5713 v := MakeMap(MapOf(TypeOf(K("")), TypeOf(V(0)))) 5714 runtime.GC() 5715 v.SetMapIndex(ValueOf(K("a")), ValueOf(V(1))) 5716 runtime.GC() 5717 5718 s := fmt.Sprint(v.Interface()) 5719 want := "map[a:1]" 5720 if s != want { 5721 t.Errorf("constructed map = %s, want %s", s, want) 5722 } 5723 5724 // check that type already in binary is found 5725 checkSameType(t, MapOf(TypeOf(V(0)), TypeOf(K(""))), map[V]K(nil)) 5726 5727 // check that invalid key type panics 5728 shouldPanic("invalid key type", func() { MapOf(TypeOf((func())(nil)), TypeOf(false)) }) 5729 } 5730 5731 func TestMapOfGCKeys(t *testing.T) { 5732 type T *uintptr 5733 tt := TypeOf(T(nil)) 5734 mt := MapOf(tt, TypeOf(false)) 5735 5736 // NOTE: The garbage collector handles allocated maps specially, 5737 // so we have to save pointers to maps in x; the pointer code will 5738 // use the gc info in the newly constructed map type. 5739 const n = 100 5740 var x []interface{} 5741 for i := 0; i < n; i++ { 5742 v := MakeMap(mt) 5743 for j := 0; j < n; j++ { 5744 p := new(uintptr) 5745 *p = uintptr(i*n + j) 5746 v.SetMapIndex(ValueOf(p).Convert(tt), ValueOf(true)) 5747 } 5748 pv := New(mt) 5749 pv.Elem().Set(v) 5750 x = append(x, pv.Interface()) 5751 } 5752 runtime.GC() 5753 5754 for i, xi := range x { 5755 v := ValueOf(xi).Elem() 5756 var out []int 5757 for _, kv := range v.MapKeys() { 5758 out = append(out, int(kv.Elem().Interface().(uintptr))) 5759 } 5760 sort.Ints(out) 5761 for j, k := range out { 5762 if k != i*n+j { 5763 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 5764 } 5765 } 5766 } 5767 } 5768 5769 func TestMapOfGCValues(t *testing.T) { 5770 type T *uintptr 5771 tt := TypeOf(T(nil)) 5772 mt := MapOf(TypeOf(1), tt) 5773 5774 // NOTE: The garbage collector handles allocated maps specially, 5775 // so we have to save pointers to maps in x; the pointer code will 5776 // use the gc info in the newly constructed map type. 5777 const n = 100 5778 var x []interface{} 5779 for i := 0; i < n; i++ { 5780 v := MakeMap(mt) 5781 for j := 0; j < n; j++ { 5782 p := new(uintptr) 5783 *p = uintptr(i*n + j) 5784 v.SetMapIndex(ValueOf(j), ValueOf(p).Convert(tt)) 5785 } 5786 pv := New(mt) 5787 pv.Elem().Set(v) 5788 x = append(x, pv.Interface()) 5789 } 5790 runtime.GC() 5791 5792 for i, xi := range x { 5793 v := ValueOf(xi).Elem() 5794 for j := 0; j < n; j++ { 5795 k := v.MapIndex(ValueOf(j)).Elem().Interface().(uintptr) 5796 if k != uintptr(i*n+j) { 5797 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 5798 } 5799 } 5800 } 5801 } 5802 5803 func TestTypelinksSorted(t *testing.T) { 5804 var last string 5805 for i, n := range TypeLinks() { 5806 if n < last { 5807 t.Errorf("typelinks not sorted: %q [%d] > %q [%d]", last, i-1, n, i) 5808 } 5809 last = n 5810 } 5811 } 5812 5813 func TestFuncOf(t *testing.T) { 5814 // check construction and use of type not in binary 5815 type K string 5816 type V float64 5817 5818 fn := func(args []Value) []Value { 5819 if len(args) != 1 { 5820 t.Errorf("args == %v, want exactly one arg", args) 5821 } else if args[0].Type() != TypeOf(K("")) { 5822 t.Errorf("args[0] is type %v, want %v", args[0].Type(), TypeOf(K(""))) 5823 } else if args[0].String() != "gopher" { 5824 t.Errorf("args[0] = %q, want %q", args[0].String(), "gopher") 5825 } 5826 return []Value{ValueOf(V(3.14))} 5827 } 5828 v := MakeFunc(FuncOf([]Type{TypeOf(K(""))}, []Type{TypeOf(V(0))}, false), fn) 5829 5830 outs := v.Call([]Value{ValueOf(K("gopher"))}) 5831 if len(outs) != 1 { 5832 t.Fatalf("v.Call returned %v, want exactly one result", outs) 5833 } else if outs[0].Type() != TypeOf(V(0)) { 5834 t.Fatalf("c.Call[0] is type %v, want %v", outs[0].Type(), TypeOf(V(0))) 5835 } 5836 f := outs[0].Float() 5837 if f != 3.14 { 5838 t.Errorf("constructed func returned %f, want %f", f, 3.14) 5839 } 5840 5841 // check that types already in binary are found 5842 type T1 int 5843 testCases := []struct { 5844 in, out []Type 5845 variadic bool 5846 want interface{} 5847 }{ 5848 {in: []Type{TypeOf(T1(0))}, want: (func(T1))(nil)}, 5849 {in: []Type{TypeOf(int(0))}, want: (func(int))(nil)}, 5850 {in: []Type{SliceOf(TypeOf(int(0)))}, variadic: true, want: (func(...int))(nil)}, 5851 {in: []Type{TypeOf(int(0))}, out: []Type{TypeOf(false)}, want: (func(int) bool)(nil)}, 5852 {in: []Type{TypeOf(int(0))}, out: []Type{TypeOf(false), TypeOf("")}, want: (func(int) (bool, string))(nil)}, 5853 } 5854 for _, tt := range testCases { 5855 checkSameType(t, FuncOf(tt.in, tt.out, tt.variadic), tt.want) 5856 } 5857 5858 // check that variadic requires last element be a slice. 5859 FuncOf([]Type{TypeOf(1), TypeOf(""), SliceOf(TypeOf(false))}, nil, true) 5860 shouldPanic("must be slice", func() { FuncOf([]Type{TypeOf(0), TypeOf(""), TypeOf(false)}, nil, true) }) 5861 shouldPanic("must be slice", func() { FuncOf(nil, nil, true) }) 5862 } 5863 5864 type B1 struct { 5865 X int 5866 Y int 5867 Z int 5868 } 5869 5870 func BenchmarkFieldByName1(b *testing.B) { 5871 t := TypeOf(B1{}) 5872 b.RunParallel(func(pb *testing.PB) { 5873 for pb.Next() { 5874 t.FieldByName("Z") 5875 } 5876 }) 5877 } 5878 5879 func BenchmarkFieldByName2(b *testing.B) { 5880 t := TypeOf(S3{}) 5881 b.RunParallel(func(pb *testing.PB) { 5882 for pb.Next() { 5883 t.FieldByName("B") 5884 } 5885 }) 5886 } 5887 5888 type R0 struct { 5889 *R1 5890 *R2 5891 *R3 5892 *R4 5893 } 5894 5895 type R1 struct { 5896 *R5 5897 *R6 5898 *R7 5899 *R8 5900 } 5901 5902 type R2 R1 5903 type R3 R1 5904 type R4 R1 5905 5906 type R5 struct { 5907 *R9 5908 *R10 5909 *R11 5910 *R12 5911 } 5912 5913 type R6 R5 5914 type R7 R5 5915 type R8 R5 5916 5917 type R9 struct { 5918 *R13 5919 *R14 5920 *R15 5921 *R16 5922 } 5923 5924 type R10 R9 5925 type R11 R9 5926 type R12 R9 5927 5928 type R13 struct { 5929 *R17 5930 *R18 5931 *R19 5932 *R20 5933 } 5934 5935 type R14 R13 5936 type R15 R13 5937 type R16 R13 5938 5939 type R17 struct { 5940 *R21 5941 *R22 5942 *R23 5943 *R24 5944 } 5945 5946 type R18 R17 5947 type R19 R17 5948 type R20 R17 5949 5950 type R21 struct { 5951 X int 5952 } 5953 5954 type R22 R21 5955 type R23 R21 5956 type R24 R21 5957 5958 func TestEmbed(t *testing.T) { 5959 typ := TypeOf(R0{}) 5960 f, ok := typ.FieldByName("X") 5961 if ok { 5962 t.Fatalf(`FieldByName("X") should fail, returned %v`, f.Index) 5963 } 5964 } 5965 5966 func BenchmarkFieldByName3(b *testing.B) { 5967 t := TypeOf(R0{}) 5968 b.RunParallel(func(pb *testing.PB) { 5969 for pb.Next() { 5970 t.FieldByName("X") 5971 } 5972 }) 5973 } 5974 5975 type S struct { 5976 i1 int64 5977 i2 int64 5978 } 5979 5980 func BenchmarkInterfaceBig(b *testing.B) { 5981 v := ValueOf(S{}) 5982 b.RunParallel(func(pb *testing.PB) { 5983 for pb.Next() { 5984 v.Interface() 5985 } 5986 }) 5987 b.StopTimer() 5988 } 5989 5990 func TestAllocsInterfaceBig(t *testing.T) { 5991 if testing.Short() { 5992 t.Skip("skipping malloc count in short mode") 5993 } 5994 v := ValueOf(S{}) 5995 if allocs := testing.AllocsPerRun(100, func() { v.Interface() }); allocs > 0 { 5996 t.Error("allocs:", allocs) 5997 } 5998 } 5999 6000 func BenchmarkInterfaceSmall(b *testing.B) { 6001 v := ValueOf(int64(0)) 6002 b.RunParallel(func(pb *testing.PB) { 6003 for pb.Next() { 6004 v.Interface() 6005 } 6006 }) 6007 } 6008 6009 func TestAllocsInterfaceSmall(t *testing.T) { 6010 if testing.Short() { 6011 t.Skip("skipping malloc count in short mode") 6012 } 6013 v := ValueOf(int64(0)) 6014 if allocs := testing.AllocsPerRun(100, func() { v.Interface() }); allocs > 0 { 6015 t.Error("allocs:", allocs) 6016 } 6017 } 6018 6019 // An exhaustive is a mechanism for writing exhaustive or stochastic tests. 6020 // The basic usage is: 6021 // 6022 // for x.Next() { 6023 // ... code using x.Maybe() or x.Choice(n) to create test cases ... 6024 // } 6025 // 6026 // Each iteration of the loop returns a different set of results, until all 6027 // possible result sets have been explored. It is okay for different code paths 6028 // to make different method call sequences on x, but there must be no 6029 // other source of non-determinism in the call sequences. 6030 // 6031 // When faced with a new decision, x chooses randomly. Future explorations 6032 // of that path will choose successive values for the result. Thus, stopping 6033 // the loop after a fixed number of iterations gives somewhat stochastic 6034 // testing. 6035 // 6036 // Example: 6037 // 6038 // for x.Next() { 6039 // v := make([]bool, x.Choose(4)) 6040 // for i := range v { 6041 // v[i] = x.Maybe() 6042 // } 6043 // fmt.Println(v) 6044 // } 6045 // 6046 // prints (in some order): 6047 // 6048 // [] 6049 // [false] 6050 // [true] 6051 // [false false] 6052 // [false true] 6053 // ... 6054 // [true true] 6055 // [false false false] 6056 // ... 6057 // [true true true] 6058 // [false false false false] 6059 // ... 6060 // [true true true true] 6061 // 6062 type exhaustive struct { 6063 r *rand.Rand 6064 pos int 6065 last []choice 6066 } 6067 6068 type choice struct { 6069 off int 6070 n int 6071 max int 6072 } 6073 6074 func (x *exhaustive) Next() bool { 6075 if x.r == nil { 6076 x.r = rand.New(rand.NewSource(time.Now().UnixNano())) 6077 } 6078 x.pos = 0 6079 if x.last == nil { 6080 x.last = []choice{} 6081 return true 6082 } 6083 for i := len(x.last) - 1; i >= 0; i-- { 6084 c := &x.last[i] 6085 if c.n+1 < c.max { 6086 c.n++ 6087 x.last = x.last[:i+1] 6088 return true 6089 } 6090 } 6091 return false 6092 } 6093 6094 func (x *exhaustive) Choose(max int) int { 6095 if x.pos >= len(x.last) { 6096 x.last = append(x.last, choice{x.r.Intn(max), 0, max}) 6097 } 6098 c := &x.last[x.pos] 6099 x.pos++ 6100 if c.max != max { 6101 panic("inconsistent use of exhaustive tester") 6102 } 6103 return (c.n + c.off) % max 6104 } 6105 6106 func (x *exhaustive) Maybe() bool { 6107 return x.Choose(2) == 1 6108 } 6109 6110 func GCFunc(args []Value) []Value { 6111 runtime.GC() 6112 return []Value{} 6113 } 6114 6115 func TestReflectFuncTraceback(t *testing.T) { 6116 f := MakeFunc(TypeOf(func() {}), GCFunc) 6117 f.Call([]Value{}) 6118 } 6119 6120 func TestReflectMethodTraceback(t *testing.T) { 6121 p := Point{3, 4} 6122 m := ValueOf(p).MethodByName("GCMethod") 6123 i := ValueOf(m.Interface()).Call([]Value{ValueOf(5)})[0].Int() 6124 if i != 8 { 6125 t.Errorf("Call returned %d; want 8", i) 6126 } 6127 } 6128 6129 func TestSmallZero(t *testing.T) { 6130 type T [10]byte 6131 typ := TypeOf(T{}) 6132 if allocs := testing.AllocsPerRun(100, func() { Zero(typ) }); allocs > 0 { 6133 t.Errorf("Creating small zero values caused %f allocs, want 0", allocs) 6134 } 6135 } 6136 6137 func TestBigZero(t *testing.T) { 6138 const size = 1 << 10 6139 var v [size]byte 6140 z := Zero(ValueOf(v).Type()).Interface().([size]byte) 6141 for i := 0; i < size; i++ { 6142 if z[i] != 0 { 6143 t.Fatalf("Zero object not all zero, index %d", i) 6144 } 6145 } 6146 } 6147 6148 func TestZeroSet(t *testing.T) { 6149 type T [16]byte 6150 type S struct { 6151 a uint64 6152 T T 6153 b uint64 6154 } 6155 v := S{ 6156 a: 0xaaaaaaaaaaaaaaaa, 6157 T: T{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9}, 6158 b: 0xbbbbbbbbbbbbbbbb, 6159 } 6160 ValueOf(&v).Elem().Field(1).Set(Zero(TypeOf(T{}))) 6161 if v != (S{ 6162 a: 0xaaaaaaaaaaaaaaaa, 6163 b: 0xbbbbbbbbbbbbbbbb, 6164 }) { 6165 t.Fatalf("Setting a field to a Zero value didn't work") 6166 } 6167 } 6168 6169 func TestFieldByIndexNil(t *testing.T) { 6170 type P struct { 6171 F int 6172 } 6173 type T struct { 6174 *P 6175 } 6176 v := ValueOf(T{}) 6177 6178 v.FieldByName("P") // should be fine 6179 6180 defer func() { 6181 if err := recover(); err == nil { 6182 t.Fatalf("no error") 6183 } else if !strings.Contains(fmt.Sprint(err), "nil pointer to embedded struct") { 6184 t.Fatalf(`err=%q, wanted error containing "nil pointer to embedded struct"`, err) 6185 } 6186 }() 6187 v.FieldByName("F") // should panic 6188 6189 t.Fatalf("did not panic") 6190 } 6191 6192 // Given 6193 // type Outer struct { 6194 // *Inner 6195 // ... 6196 // } 6197 // the compiler generates the implementation of (*Outer).M dispatching to the embedded Inner. 6198 // The implementation is logically: 6199 // func (p *Outer) M() { 6200 // (p.Inner).M() 6201 // } 6202 // but since the only change here is the replacement of one pointer receiver with another, 6203 // the actual generated code overwrites the original receiver with the p.Inner pointer and 6204 // then jumps to the M method expecting the *Inner receiver. 6205 // 6206 // During reflect.Value.Call, we create an argument frame and the associated data structures 6207 // to describe it to the garbage collector, populate the frame, call reflect.call to 6208 // run a function call using that frame, and then copy the results back out of the frame. 6209 // The reflect.call function does a memmove of the frame structure onto the 6210 // stack (to set up the inputs), runs the call, and the memmoves the stack back to 6211 // the frame structure (to preserve the outputs). 6212 // 6213 // Originally reflect.call did not distinguish inputs from outputs: both memmoves 6214 // were for the full stack frame. However, in the case where the called function was 6215 // one of these wrappers, the rewritten receiver is almost certainly a different type 6216 // than the original receiver. This is not a problem on the stack, where we use the 6217 // program counter to determine the type information and understand that 6218 // during (*Outer).M the receiver is an *Outer while during (*Inner).M the receiver in the same 6219 // memory word is now an *Inner. But in the statically typed argument frame created 6220 // by reflect, the receiver is always an *Outer. Copying the modified receiver pointer 6221 // off the stack into the frame will store an *Inner there, and then if a garbage collection 6222 // happens to scan that argument frame before it is discarded, it will scan the *Inner 6223 // memory as if it were an *Outer. If the two have different memory layouts, the 6224 // collection will interpret the memory incorrectly. 6225 // 6226 // One such possible incorrect interpretation is to treat two arbitrary memory words 6227 // (Inner.P1 and Inner.P2 below) as an interface (Outer.R below). Because interpreting 6228 // an interface requires dereferencing the itab word, the misinterpretation will try to 6229 // deference Inner.P1, causing a crash during garbage collection. 6230 // 6231 // This came up in a real program in issue 7725. 6232 6233 type Outer struct { 6234 *Inner 6235 R io.Reader 6236 } 6237 6238 type Inner struct { 6239 X *Outer 6240 P1 uintptr 6241 P2 uintptr 6242 } 6243 6244 func (pi *Inner) M() { 6245 // Clear references to pi so that the only way the 6246 // garbage collection will find the pointer is in the 6247 // argument frame, typed as a *Outer. 6248 pi.X.Inner = nil 6249 6250 // Set up an interface value that will cause a crash. 6251 // P1 = 1 is a non-zero, so the interface looks non-nil. 6252 // P2 = pi ensures that the data word points into the 6253 // allocated heap; if not the collection skips the interface 6254 // value as irrelevant, without dereferencing P1. 6255 pi.P1 = 1 6256 pi.P2 = uintptr(unsafe.Pointer(pi)) 6257 } 6258 6259 func TestCallMethodJump(t *testing.T) { 6260 // In reflect.Value.Call, trigger a garbage collection after reflect.call 6261 // returns but before the args frame has been discarded. 6262 // This is a little clumsy but makes the failure repeatable. 6263 *CallGC = true 6264 6265 p := &Outer{Inner: new(Inner)} 6266 p.Inner.X = p 6267 ValueOf(p).Method(0).Call(nil) 6268 6269 // Stop garbage collecting during reflect.call. 6270 *CallGC = false 6271 } 6272 6273 func TestCallArgLive(t *testing.T) { 6274 type T struct{ X, Y *string } // pointerful aggregate 6275 6276 F := func(t T) { *t.X = "ok" } 6277 6278 // In reflect.Value.Call, trigger a garbage collection in reflect.call 6279 // between marshaling argument and the actual call. 6280 *CallGC = true 6281 6282 x := new(string) 6283 runtime.SetFinalizer(x, func(p *string) { 6284 if *p != "ok" { 6285 t.Errorf("x dead prematurely") 6286 } 6287 }) 6288 v := T{x, nil} 6289 6290 ValueOf(F).Call([]Value{ValueOf(v)}) 6291 6292 // Stop garbage collecting during reflect.call. 6293 *CallGC = false 6294 } 6295 6296 func TestMakeFuncStackCopy(t *testing.T) { 6297 target := func(in []Value) []Value { 6298 runtime.GC() 6299 useStack(16) 6300 return []Value{ValueOf(9)} 6301 } 6302 6303 var concrete func(*int, int) int 6304 fn := MakeFunc(ValueOf(concrete).Type(), target) 6305 ValueOf(&concrete).Elem().Set(fn) 6306 x := concrete(nil, 7) 6307 if x != 9 { 6308 t.Errorf("have %#q want 9", x) 6309 } 6310 } 6311 6312 // use about n KB of stack 6313 func useStack(n int) { 6314 if n == 0 { 6315 return 6316 } 6317 var b [1024]byte // makes frame about 1KB 6318 useStack(n - 1 + int(b[99])) 6319 } 6320 6321 type Impl struct{} 6322 6323 func (Impl) F() {} 6324 6325 func TestValueString(t *testing.T) { 6326 rv := ValueOf(Impl{}) 6327 if rv.String() != "<reflect_test.Impl Value>" { 6328 t.Errorf("ValueOf(Impl{}).String() = %q, want %q", rv.String(), "<reflect_test.Impl Value>") 6329 } 6330 6331 method := rv.Method(0) 6332 if method.String() != "<func() Value>" { 6333 t.Errorf("ValueOf(Impl{}).Method(0).String() = %q, want %q", method.String(), "<func() Value>") 6334 } 6335 } 6336 6337 func TestInvalid(t *testing.T) { 6338 // Used to have inconsistency between IsValid() and Kind() != Invalid. 6339 type T struct{ v interface{} } 6340 6341 v := ValueOf(T{}).Field(0) 6342 if v.IsValid() != true || v.Kind() != Interface { 6343 t.Errorf("field: IsValid=%v, Kind=%v, want true, Interface", v.IsValid(), v.Kind()) 6344 } 6345 v = v.Elem() 6346 if v.IsValid() != false || v.Kind() != Invalid { 6347 t.Errorf("field elem: IsValid=%v, Kind=%v, want false, Invalid", v.IsValid(), v.Kind()) 6348 } 6349 } 6350 6351 // Issue 8917. 6352 func TestLargeGCProg(t *testing.T) { 6353 fv := ValueOf(func([256]*byte) {}) 6354 fv.Call([]Value{ValueOf([256]*byte{})}) 6355 } 6356 6357 func fieldIndexRecover(t Type, i int) (recovered interface{}) { 6358 defer func() { 6359 recovered = recover() 6360 }() 6361 6362 t.Field(i) 6363 return 6364 } 6365 6366 // Issue 15046. 6367 func TestTypeFieldOutOfRangePanic(t *testing.T) { 6368 typ := TypeOf(struct{ X int }{10}) 6369 testIndices := [...]struct { 6370 i int 6371 mustPanic bool 6372 }{ 6373 0: {-2, true}, 6374 1: {0, false}, 6375 2: {1, true}, 6376 3: {1 << 10, true}, 6377 } 6378 for i, tt := range testIndices { 6379 recoveredErr := fieldIndexRecover(typ, tt.i) 6380 if tt.mustPanic { 6381 if recoveredErr == nil { 6382 t.Errorf("#%d: fieldIndex %d expected to panic", i, tt.i) 6383 } 6384 } else { 6385 if recoveredErr != nil { 6386 t.Errorf("#%d: got err=%v, expected no panic", i, recoveredErr) 6387 } 6388 } 6389 } 6390 } 6391 6392 // Issue 9179. 6393 func TestCallGC(t *testing.T) { 6394 f := func(a, b, c, d, e string) { 6395 } 6396 g := func(in []Value) []Value { 6397 runtime.GC() 6398 return nil 6399 } 6400 typ := ValueOf(f).Type() 6401 f2 := MakeFunc(typ, g).Interface().(func(string, string, string, string, string)) 6402 f2("four", "five5", "six666", "seven77", "eight888") 6403 } 6404 6405 // Issue 18635 (function version). 6406 func TestKeepFuncLive(t *testing.T) { 6407 // Test that we keep makeFuncImpl live as long as it is 6408 // referenced on the stack. 6409 typ := TypeOf(func(i int) {}) 6410 var f, g func(in []Value) []Value 6411 f = func(in []Value) []Value { 6412 clobber() 6413 i := int(in[0].Int()) 6414 if i > 0 { 6415 // We can't use Value.Call here because 6416 // runtime.call* will keep the makeFuncImpl 6417 // alive. However, by converting it to an 6418 // interface value and calling that, 6419 // reflect.callReflect is the only thing that 6420 // can keep the makeFuncImpl live. 6421 // 6422 // Alternate between f and g so that if we do 6423 // reuse the memory prematurely it's more 6424 // likely to get obviously corrupted. 6425 MakeFunc(typ, g).Interface().(func(i int))(i - 1) 6426 } 6427 return nil 6428 } 6429 g = func(in []Value) []Value { 6430 clobber() 6431 i := int(in[0].Int()) 6432 MakeFunc(typ, f).Interface().(func(i int))(i) 6433 return nil 6434 } 6435 MakeFunc(typ, f).Call([]Value{ValueOf(10)}) 6436 } 6437 6438 type UnExportedFirst int 6439 6440 func (i UnExportedFirst) ΦExported() {} 6441 func (i UnExportedFirst) unexported() {} 6442 6443 // Issue 21177 6444 func TestMethodByNameUnExportedFirst(t *testing.T) { 6445 defer func() { 6446 if recover() != nil { 6447 t.Errorf("should not panic") 6448 } 6449 }() 6450 typ := TypeOf(UnExportedFirst(0)) 6451 m, _ := typ.MethodByName("ΦExported") 6452 if m.Name != "ΦExported" { 6453 t.Errorf("got %s, expected ΦExported", m.Name) 6454 } 6455 } 6456 6457 // Issue 18635 (method version). 6458 type KeepMethodLive struct{} 6459 6460 func (k KeepMethodLive) Method1(i int) { 6461 clobber() 6462 if i > 0 { 6463 ValueOf(k).MethodByName("Method2").Interface().(func(i int))(i - 1) 6464 } 6465 } 6466 6467 func (k KeepMethodLive) Method2(i int) { 6468 clobber() 6469 ValueOf(k).MethodByName("Method1").Interface().(func(i int))(i) 6470 } 6471 6472 func TestKeepMethodLive(t *testing.T) { 6473 // Test that we keep methodValue live as long as it is 6474 // referenced on the stack. 6475 KeepMethodLive{}.Method1(10) 6476 } 6477 6478 // clobber tries to clobber unreachable memory. 6479 func clobber() { 6480 runtime.GC() 6481 for i := 1; i < 32; i++ { 6482 for j := 0; j < 10; j++ { 6483 obj := make([]*byte, i) 6484 sink = obj 6485 } 6486 } 6487 runtime.GC() 6488 } 6489 6490 func TestFuncLayout(t *testing.T) { 6491 align := func(x uintptr) uintptr { 6492 return (x + PtrSize - 1) &^ (PtrSize - 1) 6493 } 6494 var r []byte 6495 if PtrSize == 4 { 6496 r = []byte{0, 0, 0, 1} 6497 } else { 6498 r = []byte{0, 0, 1} 6499 } 6500 6501 type S struct { 6502 a, b uintptr 6503 c, d *byte 6504 } 6505 6506 type test struct { 6507 rcvr, typ Type 6508 size, argsize, retOffset uintptr 6509 stack, gc, inRegs, outRegs []byte // pointer bitmap: 1 is pointer, 0 is scalar 6510 intRegs, floatRegs int 6511 floatRegSize uintptr 6512 } 6513 tests := []test{ 6514 { 6515 typ: ValueOf(func(a, b string) string { return "" }).Type(), 6516 size: 6 * PtrSize, 6517 argsize: 4 * PtrSize, 6518 retOffset: 4 * PtrSize, 6519 stack: []byte{1, 0, 1, 0, 1}, 6520 gc: []byte{1, 0, 1, 0, 1}, 6521 }, 6522 { 6523 typ: ValueOf(func(a, b, c uint32, p *byte, d uint16) {}).Type(), 6524 size: align(align(3*4) + PtrSize + 2), 6525 argsize: align(3*4) + PtrSize + 2, 6526 retOffset: align(align(3*4) + PtrSize + 2), 6527 stack: r, 6528 gc: r, 6529 }, 6530 { 6531 typ: ValueOf(func(a map[int]int, b uintptr, c interface{}) {}).Type(), 6532 size: 4 * PtrSize, 6533 argsize: 4 * PtrSize, 6534 retOffset: 4 * PtrSize, 6535 stack: []byte{1, 0, 1, 1}, 6536 gc: []byte{1, 0, 1, 1}, 6537 }, 6538 { 6539 typ: ValueOf(func(a S) {}).Type(), 6540 size: 4 * PtrSize, 6541 argsize: 4 * PtrSize, 6542 retOffset: 4 * PtrSize, 6543 stack: []byte{0, 0, 1, 1}, 6544 gc: []byte{0, 0, 1, 1}, 6545 }, 6546 { 6547 rcvr: ValueOf((*byte)(nil)).Type(), 6548 typ: ValueOf(func(a uintptr, b *int) {}).Type(), 6549 size: 3 * PtrSize, 6550 argsize: 3 * PtrSize, 6551 retOffset: 3 * PtrSize, 6552 stack: []byte{1, 0, 1}, 6553 gc: []byte{1, 0, 1}, 6554 }, 6555 { 6556 typ: ValueOf(func(a uintptr) {}).Type(), 6557 size: PtrSize, 6558 argsize: PtrSize, 6559 retOffset: PtrSize, 6560 stack: []byte{}, 6561 gc: []byte{}, 6562 }, 6563 { 6564 typ: ValueOf(func() uintptr { return 0 }).Type(), 6565 size: PtrSize, 6566 argsize: 0, 6567 retOffset: 0, 6568 stack: []byte{}, 6569 gc: []byte{}, 6570 }, 6571 { 6572 rcvr: ValueOf(uintptr(0)).Type(), 6573 typ: ValueOf(func(a uintptr) {}).Type(), 6574 size: 2 * PtrSize, 6575 argsize: 2 * PtrSize, 6576 retOffset: 2 * PtrSize, 6577 stack: []byte{1}, 6578 gc: []byte{1}, 6579 // Note: this one is tricky, as the receiver is not a pointer. But we 6580 // pass the receiver by reference to the autogenerated pointer-receiver 6581 // version of the function. 6582 }, 6583 // TODO(mknyszek): Add tests for non-zero register count. 6584 } 6585 for _, lt := range tests { 6586 name := lt.typ.String() 6587 if lt.rcvr != nil { 6588 name = lt.rcvr.String() + "." + name 6589 } 6590 t.Run(name, func(t *testing.T) { 6591 defer SetArgRegs(SetArgRegs(lt.intRegs, lt.floatRegs, lt.floatRegSize)) 6592 6593 typ, argsize, retOffset, stack, gc, inRegs, outRegs, ptrs := FuncLayout(lt.typ, lt.rcvr) 6594 if typ.Size() != lt.size { 6595 t.Errorf("funcLayout(%v, %v).size=%d, want %d", lt.typ, lt.rcvr, typ.Size(), lt.size) 6596 } 6597 if argsize != lt.argsize { 6598 t.Errorf("funcLayout(%v, %v).argsize=%d, want %d", lt.typ, lt.rcvr, argsize, lt.argsize) 6599 } 6600 if retOffset != lt.retOffset { 6601 t.Errorf("funcLayout(%v, %v).retOffset=%d, want %d", lt.typ, lt.rcvr, retOffset, lt.retOffset) 6602 } 6603 if !bytes.Equal(stack, lt.stack) { 6604 t.Errorf("funcLayout(%v, %v).stack=%v, want %v", lt.typ, lt.rcvr, stack, lt.stack) 6605 } 6606 if !bytes.Equal(gc, lt.gc) { 6607 t.Errorf("funcLayout(%v, %v).gc=%v, want %v", lt.typ, lt.rcvr, gc, lt.gc) 6608 } 6609 if !bytes.Equal(inRegs, lt.inRegs) { 6610 t.Errorf("funcLayout(%v, %v).inRegs=%v, want %v", lt.typ, lt.rcvr, inRegs, lt.inRegs) 6611 } 6612 if !bytes.Equal(outRegs, lt.outRegs) { 6613 t.Errorf("funcLayout(%v, %v).outRegs=%v, want %v", lt.typ, lt.rcvr, outRegs, lt.outRegs) 6614 } 6615 if ptrs && len(stack) == 0 || !ptrs && len(stack) > 0 { 6616 t.Errorf("funcLayout(%v, %v) pointers flag=%v, want %v", lt.typ, lt.rcvr, ptrs, !ptrs) 6617 } 6618 }) 6619 } 6620 } 6621 6622 func verifyGCBits(t *testing.T, typ Type, bits []byte) { 6623 heapBits := GCBits(New(typ).Interface()) 6624 if !bytes.Equal(heapBits, bits) { 6625 _, _, line, _ := runtime.Caller(1) 6626 t.Errorf("line %d: heapBits incorrect for %v\nhave %v\nwant %v", line, typ, heapBits, bits) 6627 } 6628 } 6629 6630 func verifyGCBitsSlice(t *testing.T, typ Type, cap int, bits []byte) { 6631 // Creating a slice causes the runtime to repeat a bitmap, 6632 // which exercises a different path from making the compiler 6633 // repeat a bitmap for a small array or executing a repeat in 6634 // a GC program. 6635 val := MakeSlice(typ, 0, cap) 6636 data := NewAt(ArrayOf(cap, typ), unsafe.Pointer(val.Pointer())) 6637 heapBits := GCBits(data.Interface()) 6638 // Repeat the bitmap for the slice size, trimming scalars in 6639 // the last element. 6640 bits = rep(cap, bits) 6641 for len(bits) > 0 && bits[len(bits)-1] == 0 { 6642 bits = bits[:len(bits)-1] 6643 } 6644 if !bytes.Equal(heapBits, bits) { 6645 t.Errorf("heapBits incorrect for make(%v, 0, %v)\nhave %v\nwant %v", typ, cap, heapBits, bits) 6646 } 6647 } 6648 6649 func TestGCBits(t *testing.T) { 6650 verifyGCBits(t, TypeOf((*byte)(nil)), []byte{1}) 6651 6652 // Building blocks for types seen by the compiler (like [2]Xscalar). 6653 // The compiler will create the type structures for the derived types, 6654 // including their GC metadata. 6655 type Xscalar struct{ x uintptr } 6656 type Xptr struct{ x *byte } 6657 type Xptrscalar struct { 6658 *byte 6659 uintptr 6660 } 6661 type Xscalarptr struct { 6662 uintptr 6663 *byte 6664 } 6665 type Xbigptrscalar struct { 6666 _ [100]*byte 6667 _ [100]uintptr 6668 } 6669 6670 var Tscalar, Tint64, Tptr, Tscalarptr, Tptrscalar, Tbigptrscalar Type 6671 { 6672 // Building blocks for types constructed by reflect. 6673 // This code is in a separate block so that code below 6674 // cannot accidentally refer to these. 6675 // The compiler must NOT see types derived from these 6676 // (for example, [2]Scalar must NOT appear in the program), 6677 // or else reflect will use it instead of having to construct one. 6678 // The goal is to test the construction. 6679 type Scalar struct{ x uintptr } 6680 type Ptr struct{ x *byte } 6681 type Ptrscalar struct { 6682 *byte 6683 uintptr 6684 } 6685 type Scalarptr struct { 6686 uintptr 6687 *byte 6688 } 6689 type Bigptrscalar struct { 6690 _ [100]*byte 6691 _ [100]uintptr 6692 } 6693 type Int64 int64 6694 Tscalar = TypeOf(Scalar{}) 6695 Tint64 = TypeOf(Int64(0)) 6696 Tptr = TypeOf(Ptr{}) 6697 Tscalarptr = TypeOf(Scalarptr{}) 6698 Tptrscalar = TypeOf(Ptrscalar{}) 6699 Tbigptrscalar = TypeOf(Bigptrscalar{}) 6700 } 6701 6702 empty := []byte{} 6703 6704 verifyGCBits(t, TypeOf(Xscalar{}), empty) 6705 verifyGCBits(t, Tscalar, empty) 6706 verifyGCBits(t, TypeOf(Xptr{}), lit(1)) 6707 verifyGCBits(t, Tptr, lit(1)) 6708 verifyGCBits(t, TypeOf(Xscalarptr{}), lit(0, 1)) 6709 verifyGCBits(t, Tscalarptr, lit(0, 1)) 6710 verifyGCBits(t, TypeOf(Xptrscalar{}), lit(1)) 6711 verifyGCBits(t, Tptrscalar, lit(1)) 6712 6713 verifyGCBits(t, TypeOf([0]Xptr{}), empty) 6714 verifyGCBits(t, ArrayOf(0, Tptr), empty) 6715 verifyGCBits(t, TypeOf([1]Xptrscalar{}), lit(1)) 6716 verifyGCBits(t, ArrayOf(1, Tptrscalar), lit(1)) 6717 verifyGCBits(t, TypeOf([2]Xscalar{}), empty) 6718 verifyGCBits(t, ArrayOf(2, Tscalar), empty) 6719 verifyGCBits(t, TypeOf([10000]Xscalar{}), empty) 6720 verifyGCBits(t, ArrayOf(10000, Tscalar), empty) 6721 verifyGCBits(t, TypeOf([2]Xptr{}), lit(1, 1)) 6722 verifyGCBits(t, ArrayOf(2, Tptr), lit(1, 1)) 6723 verifyGCBits(t, TypeOf([10000]Xptr{}), rep(10000, lit(1))) 6724 verifyGCBits(t, ArrayOf(10000, Tptr), rep(10000, lit(1))) 6725 verifyGCBits(t, TypeOf([2]Xscalarptr{}), lit(0, 1, 0, 1)) 6726 verifyGCBits(t, ArrayOf(2, Tscalarptr), lit(0, 1, 0, 1)) 6727 verifyGCBits(t, TypeOf([10000]Xscalarptr{}), rep(10000, lit(0, 1))) 6728 verifyGCBits(t, ArrayOf(10000, Tscalarptr), rep(10000, lit(0, 1))) 6729 verifyGCBits(t, TypeOf([2]Xptrscalar{}), lit(1, 0, 1)) 6730 verifyGCBits(t, ArrayOf(2, Tptrscalar), lit(1, 0, 1)) 6731 verifyGCBits(t, TypeOf([10000]Xptrscalar{}), rep(10000, lit(1, 0))) 6732 verifyGCBits(t, ArrayOf(10000, Tptrscalar), rep(10000, lit(1, 0))) 6733 verifyGCBits(t, TypeOf([1][10000]Xptrscalar{}), rep(10000, lit(1, 0))) 6734 verifyGCBits(t, ArrayOf(1, ArrayOf(10000, Tptrscalar)), rep(10000, lit(1, 0))) 6735 verifyGCBits(t, TypeOf([2][10000]Xptrscalar{}), rep(2*10000, lit(1, 0))) 6736 verifyGCBits(t, ArrayOf(2, ArrayOf(10000, Tptrscalar)), rep(2*10000, lit(1, 0))) 6737 verifyGCBits(t, TypeOf([4]Xbigptrscalar{}), join(rep(3, join(rep(100, lit(1)), rep(100, lit(0)))), rep(100, lit(1)))) 6738 verifyGCBits(t, ArrayOf(4, Tbigptrscalar), join(rep(3, join(rep(100, lit(1)), rep(100, lit(0)))), rep(100, lit(1)))) 6739 6740 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 0, empty) 6741 verifyGCBitsSlice(t, SliceOf(Tptr), 0, empty) 6742 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 1, lit(1)) 6743 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 1, lit(1)) 6744 verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 2, lit(0)) 6745 verifyGCBitsSlice(t, SliceOf(Tscalar), 2, lit(0)) 6746 verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 10000, lit(0)) 6747 verifyGCBitsSlice(t, SliceOf(Tscalar), 10000, lit(0)) 6748 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 2, lit(1)) 6749 verifyGCBitsSlice(t, SliceOf(Tptr), 2, lit(1)) 6750 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 10000, lit(1)) 6751 verifyGCBitsSlice(t, SliceOf(Tptr), 10000, lit(1)) 6752 verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 2, lit(0, 1)) 6753 verifyGCBitsSlice(t, SliceOf(Tscalarptr), 2, lit(0, 1)) 6754 verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 10000, lit(0, 1)) 6755 verifyGCBitsSlice(t, SliceOf(Tscalarptr), 10000, lit(0, 1)) 6756 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 2, lit(1, 0)) 6757 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 2, lit(1, 0)) 6758 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 10000, lit(1, 0)) 6759 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 10000, lit(1, 0)) 6760 verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 1, rep(10000, lit(1, 0))) 6761 verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 1, rep(10000, lit(1, 0))) 6762 verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 2, rep(10000, lit(1, 0))) 6763 verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 2, rep(10000, lit(1, 0))) 6764 verifyGCBitsSlice(t, TypeOf([]Xbigptrscalar{}), 4, join(rep(100, lit(1)), rep(100, lit(0)))) 6765 verifyGCBitsSlice(t, SliceOf(Tbigptrscalar), 4, join(rep(100, lit(1)), rep(100, lit(0)))) 6766 6767 verifyGCBits(t, TypeOf((chan [100]Xscalar)(nil)), lit(1)) 6768 verifyGCBits(t, ChanOf(BothDir, ArrayOf(100, Tscalar)), lit(1)) 6769 6770 verifyGCBits(t, TypeOf((func([10000]Xscalarptr))(nil)), lit(1)) 6771 verifyGCBits(t, FuncOf([]Type{ArrayOf(10000, Tscalarptr)}, nil, false), lit(1)) 6772 6773 verifyGCBits(t, TypeOf((map[[10000]Xscalarptr]Xscalar)(nil)), lit(1)) 6774 verifyGCBits(t, MapOf(ArrayOf(10000, Tscalarptr), Tscalar), lit(1)) 6775 6776 verifyGCBits(t, TypeOf((*[10000]Xscalar)(nil)), lit(1)) 6777 verifyGCBits(t, PtrTo(ArrayOf(10000, Tscalar)), lit(1)) 6778 6779 verifyGCBits(t, TypeOf(([][10000]Xscalar)(nil)), lit(1)) 6780 verifyGCBits(t, SliceOf(ArrayOf(10000, Tscalar)), lit(1)) 6781 6782 hdr := make([]byte, 8/PtrSize) 6783 6784 verifyMapBucket := func(t *testing.T, k, e Type, m interface{}, want []byte) { 6785 verifyGCBits(t, MapBucketOf(k, e), want) 6786 verifyGCBits(t, CachedBucketOf(TypeOf(m)), want) 6787 } 6788 verifyMapBucket(t, 6789 Tscalar, Tptr, 6790 map[Xscalar]Xptr(nil), 6791 join(hdr, rep(8, lit(0)), rep(8, lit(1)), lit(1))) 6792 verifyMapBucket(t, 6793 Tscalarptr, Tptr, 6794 map[Xscalarptr]Xptr(nil), 6795 join(hdr, rep(8, lit(0, 1)), rep(8, lit(1)), lit(1))) 6796 verifyMapBucket(t, Tint64, Tptr, 6797 map[int64]Xptr(nil), 6798 join(hdr, rep(8, rep(8/PtrSize, lit(0))), rep(8, lit(1)), lit(1))) 6799 verifyMapBucket(t, 6800 Tscalar, Tscalar, 6801 map[Xscalar]Xscalar(nil), 6802 empty) 6803 verifyMapBucket(t, 6804 ArrayOf(2, Tscalarptr), ArrayOf(3, Tptrscalar), 6805 map[[2]Xscalarptr][3]Xptrscalar(nil), 6806 join(hdr, rep(8*2, lit(0, 1)), rep(8*3, lit(1, 0)), lit(1))) 6807 verifyMapBucket(t, 6808 ArrayOf(64/PtrSize, Tscalarptr), ArrayOf(64/PtrSize, Tptrscalar), 6809 map[[64 / PtrSize]Xscalarptr][64 / PtrSize]Xptrscalar(nil), 6810 join(hdr, rep(8*64/PtrSize, lit(0, 1)), rep(8*64/PtrSize, lit(1, 0)), lit(1))) 6811 verifyMapBucket(t, 6812 ArrayOf(64/PtrSize+1, Tscalarptr), ArrayOf(64/PtrSize, Tptrscalar), 6813 map[[64/PtrSize + 1]Xscalarptr][64 / PtrSize]Xptrscalar(nil), 6814 join(hdr, rep(8, lit(1)), rep(8*64/PtrSize, lit(1, 0)), lit(1))) 6815 verifyMapBucket(t, 6816 ArrayOf(64/PtrSize, Tscalarptr), ArrayOf(64/PtrSize+1, Tptrscalar), 6817 map[[64 / PtrSize]Xscalarptr][64/PtrSize + 1]Xptrscalar(nil), 6818 join(hdr, rep(8*64/PtrSize, lit(0, 1)), rep(8, lit(1)), lit(1))) 6819 verifyMapBucket(t, 6820 ArrayOf(64/PtrSize+1, Tscalarptr), ArrayOf(64/PtrSize+1, Tptrscalar), 6821 map[[64/PtrSize + 1]Xscalarptr][64/PtrSize + 1]Xptrscalar(nil), 6822 join(hdr, rep(8, lit(1)), rep(8, lit(1)), lit(1))) 6823 } 6824 6825 func rep(n int, b []byte) []byte { return bytes.Repeat(b, n) } 6826 func join(b ...[]byte) []byte { return bytes.Join(b, nil) } 6827 func lit(x ...byte) []byte { return x } 6828 6829 func TestTypeOfTypeOf(t *testing.T) { 6830 // Check that all the type constructors return concrete *rtype implementations. 6831 // It's difficult to test directly because the reflect package is only at arm's length. 6832 // The easiest thing to do is just call a function that crashes if it doesn't get an *rtype. 6833 check := func(name string, typ Type) { 6834 if underlying := TypeOf(typ).String(); underlying != "*reflect.rtype" { 6835 t.Errorf("%v returned %v, not *reflect.rtype", name, underlying) 6836 } 6837 } 6838 6839 type T struct{ int } 6840 check("TypeOf", TypeOf(T{})) 6841 6842 check("ArrayOf", ArrayOf(10, TypeOf(T{}))) 6843 check("ChanOf", ChanOf(BothDir, TypeOf(T{}))) 6844 check("FuncOf", FuncOf([]Type{TypeOf(T{})}, nil, false)) 6845 check("MapOf", MapOf(TypeOf(T{}), TypeOf(T{}))) 6846 check("PtrTo", PtrTo(TypeOf(T{}))) 6847 check("SliceOf", SliceOf(TypeOf(T{}))) 6848 } 6849 6850 type XM struct{ _ bool } 6851 6852 func (*XM) String() string { return "" } 6853 6854 func TestPtrToMethods(t *testing.T) { 6855 var y struct{ XM } 6856 yp := New(TypeOf(y)).Interface() 6857 _, ok := yp.(fmt.Stringer) 6858 if !ok { 6859 t.Fatal("does not implement Stringer, but should") 6860 } 6861 } 6862 6863 func TestMapAlloc(t *testing.T) { 6864 m := ValueOf(make(map[int]int, 10)) 6865 k := ValueOf(5) 6866 v := ValueOf(7) 6867 allocs := testing.AllocsPerRun(100, func() { 6868 m.SetMapIndex(k, v) 6869 }) 6870 if allocs > 0.5 { 6871 t.Errorf("allocs per map assignment: want 0 got %f", allocs) 6872 } 6873 6874 const size = 1000 6875 tmp := 0 6876 val := ValueOf(&tmp).Elem() 6877 allocs = testing.AllocsPerRun(100, func() { 6878 mv := MakeMapWithSize(TypeOf(map[int]int{}), size) 6879 // Only adding half of the capacity to not trigger re-allocations due too many overloaded buckets. 6880 for i := 0; i < size/2; i++ { 6881 val.SetInt(int64(i)) 6882 mv.SetMapIndex(val, val) 6883 } 6884 }) 6885 if allocs > 10 { 6886 t.Errorf("allocs per map assignment: want at most 10 got %f", allocs) 6887 } 6888 // Empirical testing shows that with capacity hint single run will trigger 3 allocations and without 91. I set 6889 // the threshold to 10, to not make it overly brittle if something changes in the initial allocation of the 6890 // map, but to still catch a regression where we keep re-allocating in the hashmap as new entries are added. 6891 } 6892 6893 func TestChanAlloc(t *testing.T) { 6894 // Note: for a chan int, the return Value must be allocated, so we 6895 // use a chan *int instead. 6896 c := ValueOf(make(chan *int, 1)) 6897 v := ValueOf(new(int)) 6898 allocs := testing.AllocsPerRun(100, func() { 6899 c.Send(v) 6900 _, _ = c.Recv() 6901 }) 6902 if allocs < 0.5 || allocs > 1.5 { 6903 t.Errorf("allocs per chan send/recv: want 1 got %f", allocs) 6904 } 6905 // Note: there is one allocation in reflect.recv which seems to be 6906 // a limitation of escape analysis. If that is ever fixed the 6907 // allocs < 0.5 condition will trigger and this test should be fixed. 6908 } 6909 6910 type TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678 int 6911 6912 type nameTest struct { 6913 v interface{} 6914 want string 6915 } 6916 6917 var nameTests = []nameTest{ 6918 {(*int32)(nil), "int32"}, 6919 {(*D1)(nil), "D1"}, 6920 {(*[]D1)(nil), ""}, 6921 {(*chan D1)(nil), ""}, 6922 {(*func() D1)(nil), ""}, 6923 {(*<-chan D1)(nil), ""}, 6924 {(*chan<- D1)(nil), ""}, 6925 {(*interface{})(nil), ""}, 6926 {(*interface { 6927 F() 6928 })(nil), ""}, 6929 {(*TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678)(nil), "TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678"}, 6930 } 6931 6932 func TestNames(t *testing.T) { 6933 for _, test := range nameTests { 6934 typ := TypeOf(test.v).Elem() 6935 if got := typ.Name(); got != test.want { 6936 t.Errorf("%v Name()=%q, want %q", typ, got, test.want) 6937 } 6938 } 6939 } 6940 6941 func TestExported(t *testing.T) { 6942 type ΦExported struct{} 6943 type φUnexported struct{} 6944 type BigP *big 6945 type P int 6946 type p *P 6947 type P2 p 6948 type p3 p 6949 6950 type exportTest struct { 6951 v interface{} 6952 want bool 6953 } 6954 exportTests := []exportTest{ 6955 {D1{}, true}, 6956 {(*D1)(nil), true}, 6957 {big{}, false}, 6958 {(*big)(nil), false}, 6959 {(BigP)(nil), true}, 6960 {(*BigP)(nil), true}, 6961 {ΦExported{}, true}, 6962 {φUnexported{}, false}, 6963 {P(0), true}, 6964 {(p)(nil), false}, 6965 {(P2)(nil), true}, 6966 {(p3)(nil), false}, 6967 } 6968 6969 for i, test := range exportTests { 6970 typ := TypeOf(test.v) 6971 if got := IsExported(typ); got != test.want { 6972 t.Errorf("%d: %s exported=%v, want %v", i, typ.Name(), got, test.want) 6973 } 6974 } 6975 } 6976 6977 func TestTypeStrings(t *testing.T) { 6978 type stringTest struct { 6979 typ Type 6980 want string 6981 } 6982 stringTests := []stringTest{ 6983 {TypeOf(func(int) {}), "func(int)"}, 6984 {FuncOf([]Type{TypeOf(int(0))}, nil, false), "func(int)"}, 6985 {TypeOf(XM{}), "reflect_test.XM"}, 6986 {TypeOf(new(XM)), "*reflect_test.XM"}, 6987 {TypeOf(new(XM).String), "func() string"}, 6988 {TypeOf(new(XM)).Method(0).Type, "func(*reflect_test.XM) string"}, 6989 {ChanOf(3, TypeOf(XM{})), "chan reflect_test.XM"}, 6990 {MapOf(TypeOf(int(0)), TypeOf(XM{})), "map[int]reflect_test.XM"}, 6991 {ArrayOf(3, TypeOf(XM{})), "[3]reflect_test.XM"}, 6992 {ArrayOf(3, TypeOf(struct{}{})), "[3]struct {}"}, 6993 } 6994 6995 for i, test := range stringTests { 6996 if got, want := test.typ.String(), test.want; got != want { 6997 t.Errorf("type %d String()=%q, want %q", i, got, want) 6998 } 6999 } 7000 } 7001 7002 func TestOffsetLock(t *testing.T) { 7003 var wg sync.WaitGroup 7004 for i := 0; i < 4; i++ { 7005 i := i 7006 wg.Add(1) 7007 go func() { 7008 for j := 0; j < 50; j++ { 7009 ResolveReflectName(fmt.Sprintf("OffsetLockName:%d:%d", i, j)) 7010 } 7011 wg.Done() 7012 }() 7013 } 7014 wg.Wait() 7015 } 7016 7017 func BenchmarkNew(b *testing.B) { 7018 v := TypeOf(XM{}) 7019 b.RunParallel(func(pb *testing.PB) { 7020 for pb.Next() { 7021 New(v) 7022 } 7023 }) 7024 } 7025 7026 func TestSwapper(t *testing.T) { 7027 type I int 7028 var a, b, c I 7029 type pair struct { 7030 x, y int 7031 } 7032 type pairPtr struct { 7033 x, y int 7034 p *I 7035 } 7036 type S string 7037 7038 tests := []struct { 7039 in interface{} 7040 i, j int 7041 want interface{} 7042 }{ 7043 { 7044 in: []int{1, 20, 300}, 7045 i: 0, 7046 j: 2, 7047 want: []int{300, 20, 1}, 7048 }, 7049 { 7050 in: []uintptr{1, 20, 300}, 7051 i: 0, 7052 j: 2, 7053 want: []uintptr{300, 20, 1}, 7054 }, 7055 { 7056 in: []int16{1, 20, 300}, 7057 i: 0, 7058 j: 2, 7059 want: []int16{300, 20, 1}, 7060 }, 7061 { 7062 in: []int8{1, 20, 100}, 7063 i: 0, 7064 j: 2, 7065 want: []int8{100, 20, 1}, 7066 }, 7067 { 7068 in: []*I{&a, &b, &c}, 7069 i: 0, 7070 j: 2, 7071 want: []*I{&c, &b, &a}, 7072 }, 7073 { 7074 in: []string{"eric", "sergey", "larry"}, 7075 i: 0, 7076 j: 2, 7077 want: []string{"larry", "sergey", "eric"}, 7078 }, 7079 { 7080 in: []S{"eric", "sergey", "larry"}, 7081 i: 0, 7082 j: 2, 7083 want: []S{"larry", "sergey", "eric"}, 7084 }, 7085 { 7086 in: []pair{{1, 2}, {3, 4}, {5, 6}}, 7087 i: 0, 7088 j: 2, 7089 want: []pair{{5, 6}, {3, 4}, {1, 2}}, 7090 }, 7091 { 7092 in: []pairPtr{{1, 2, &a}, {3, 4, &b}, {5, 6, &c}}, 7093 i: 0, 7094 j: 2, 7095 want: []pairPtr{{5, 6, &c}, {3, 4, &b}, {1, 2, &a}}, 7096 }, 7097 } 7098 7099 for i, tt := range tests { 7100 inStr := fmt.Sprint(tt.in) 7101 Swapper(tt.in)(tt.i, tt.j) 7102 if !DeepEqual(tt.in, tt.want) { 7103 t.Errorf("%d. swapping %v and %v of %v = %v; want %v", i, tt.i, tt.j, inStr, tt.in, tt.want) 7104 } 7105 } 7106 } 7107 7108 // TestUnaddressableField tests that the reflect package will not allow 7109 // a type from another package to be used as a named type with an 7110 // unexported field. 7111 // 7112 // This ensures that unexported fields cannot be modified by other packages. 7113 func TestUnaddressableField(t *testing.T) { 7114 var b Buffer // type defined in reflect, a different package 7115 var localBuffer struct { 7116 buf []byte 7117 } 7118 lv := ValueOf(&localBuffer).Elem() 7119 rv := ValueOf(b) 7120 shouldPanic("Set", func() { 7121 lv.Set(rv) 7122 }) 7123 } 7124 7125 type Tint int 7126 7127 type Tint2 = Tint 7128 7129 type Talias1 struct { 7130 byte 7131 uint8 7132 int 7133 int32 7134 rune 7135 } 7136 7137 type Talias2 struct { 7138 Tint 7139 Tint2 7140 } 7141 7142 func TestAliasNames(t *testing.T) { 7143 t1 := Talias1{byte: 1, uint8: 2, int: 3, int32: 4, rune: 5} 7144 out := fmt.Sprintf("%#v", t1) 7145 want := "reflect_test.Talias1{byte:0x1, uint8:0x2, int:3, int32:4, rune:5}" 7146 if out != want { 7147 t.Errorf("Talias1 print:\nhave: %s\nwant: %s", out, want) 7148 } 7149 7150 t2 := Talias2{Tint: 1, Tint2: 2} 7151 out = fmt.Sprintf("%#v", t2) 7152 want = "reflect_test.Talias2{Tint:1, Tint2:2}" 7153 if out != want { 7154 t.Errorf("Talias2 print:\nhave: %s\nwant: %s", out, want) 7155 } 7156 } 7157 7158 func TestIssue22031(t *testing.T) { 7159 type s []struct{ C int } 7160 7161 type t1 struct{ s } 7162 type t2 struct{ f s } 7163 7164 tests := []Value{ 7165 ValueOf(t1{s{{}}}).Field(0).Index(0).Field(0), 7166 ValueOf(t2{s{{}}}).Field(0).Index(0).Field(0), 7167 } 7168 7169 for i, test := range tests { 7170 if test.CanSet() { 7171 t.Errorf("%d: CanSet: got true, want false", i) 7172 } 7173 } 7174 } 7175 7176 type NonExportedFirst int 7177 7178 func (i NonExportedFirst) ΦExported() {} 7179 func (i NonExportedFirst) nonexported() int { panic("wrong") } 7180 7181 func TestIssue22073(t *testing.T) { 7182 m := ValueOf(NonExportedFirst(0)).Method(0) 7183 7184 if got := m.Type().NumOut(); got != 0 { 7185 t.Errorf("NumOut: got %v, want 0", got) 7186 } 7187 7188 // Shouldn't panic. 7189 m.Call(nil) 7190 } 7191 7192 func TestMapIterNonEmptyMap(t *testing.T) { 7193 m := map[string]int{"one": 1, "two": 2, "three": 3} 7194 iter := ValueOf(m).MapRange() 7195 if got, want := iterateToString(iter), `[one: 1, three: 3, two: 2]`; got != want { 7196 t.Errorf("iterator returned %s (after sorting), want %s", got, want) 7197 } 7198 } 7199 7200 func TestMapIterNilMap(t *testing.T) { 7201 var m map[string]int 7202 iter := ValueOf(m).MapRange() 7203 if got, want := iterateToString(iter), `[]`; got != want { 7204 t.Errorf("non-empty result iteratoring nil map: %s", got) 7205 } 7206 } 7207 7208 func TestMapIterSafety(t *testing.T) { 7209 // Using a zero MapIter causes a panic, but not a crash. 7210 func() { 7211 defer func() { recover() }() 7212 new(MapIter).Key() 7213 t.Fatal("Key did not panic") 7214 }() 7215 func() { 7216 defer func() { recover() }() 7217 new(MapIter).Value() 7218 t.Fatal("Value did not panic") 7219 }() 7220 func() { 7221 defer func() { recover() }() 7222 new(MapIter).Next() 7223 t.Fatal("Next did not panic") 7224 }() 7225 7226 // Calling Key/Value on a MapIter before Next 7227 // causes a panic, but not a crash. 7228 var m map[string]int 7229 iter := ValueOf(m).MapRange() 7230 7231 func() { 7232 defer func() { recover() }() 7233 iter.Key() 7234 t.Fatal("Key did not panic") 7235 }() 7236 func() { 7237 defer func() { recover() }() 7238 iter.Value() 7239 t.Fatal("Value did not panic") 7240 }() 7241 7242 // Calling Next, Key, or Value on an exhausted iterator 7243 // causes a panic, but not a crash. 7244 iter.Next() // -> false 7245 func() { 7246 defer func() { recover() }() 7247 iter.Key() 7248 t.Fatal("Key did not panic") 7249 }() 7250 func() { 7251 defer func() { recover() }() 7252 iter.Value() 7253 t.Fatal("Value did not panic") 7254 }() 7255 func() { 7256 defer func() { recover() }() 7257 iter.Next() 7258 t.Fatal("Next did not panic") 7259 }() 7260 } 7261 7262 func TestMapIterNext(t *testing.T) { 7263 // The first call to Next should reflect any 7264 // insertions to the map since the iterator was created. 7265 m := map[string]int{} 7266 iter := ValueOf(m).MapRange() 7267 m["one"] = 1 7268 if got, want := iterateToString(iter), `[one: 1]`; got != want { 7269 t.Errorf("iterator returned deleted elements: got %s, want %s", got, want) 7270 } 7271 } 7272 7273 func TestMapIterDelete0(t *testing.T) { 7274 // Delete all elements before first iteration. 7275 m := map[string]int{"one": 1, "two": 2, "three": 3} 7276 iter := ValueOf(m).MapRange() 7277 delete(m, "one") 7278 delete(m, "two") 7279 delete(m, "three") 7280 if got, want := iterateToString(iter), `[]`; got != want { 7281 t.Errorf("iterator returned deleted elements: got %s, want %s", got, want) 7282 } 7283 } 7284 7285 func TestMapIterDelete1(t *testing.T) { 7286 // Delete all elements after first iteration. 7287 m := map[string]int{"one": 1, "two": 2, "three": 3} 7288 iter := ValueOf(m).MapRange() 7289 var got []string 7290 for iter.Next() { 7291 got = append(got, fmt.Sprint(iter.Key(), iter.Value())) 7292 delete(m, "one") 7293 delete(m, "two") 7294 delete(m, "three") 7295 } 7296 if len(got) != 1 { 7297 t.Errorf("iterator returned wrong number of elements: got %d, want 1", len(got)) 7298 } 7299 } 7300 7301 // iterateToString returns the set of elements 7302 // returned by an iterator in readable form. 7303 func iterateToString(it *MapIter) string { 7304 var got []string 7305 for it.Next() { 7306 line := fmt.Sprintf("%v: %v", it.Key(), it.Value()) 7307 got = append(got, line) 7308 } 7309 sort.Strings(got) 7310 return "[" + strings.Join(got, ", ") + "]" 7311 } 7312 7313 func TestConvertibleTo(t *testing.T) { 7314 t1 := ValueOf(example1.MyStruct{}).Type() 7315 t2 := ValueOf(example2.MyStruct{}).Type() 7316 7317 // Shouldn't raise stack overflow 7318 if t1.ConvertibleTo(t2) { 7319 t.Fatalf("(%s).ConvertibleTo(%s) = true, want false", t1, t2) 7320 } 7321 }