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 5package reflect_test 6 7import ( 8 "bytes" 9 "encoding/base64" 10 "flag" 11 "fmt" 12 "go/token" 13 "internal/goarch" 14 "io" 15 "math" 16 "math/rand" 17 "os" 18 . "reflect" 19 "reflect/internal/example1" 20 "reflect/internal/example2" 21 "runtime" 22 "sort" 23 "strconv" 24 "strings" 25 "sync" 26 "sync/atomic" 27 "testing" 28 "time" 29 "unsafe" 30) 31 32var sink any 33 34func TestBool(t *testing.T) { 35 v := ValueOf(true) 36 if v.Bool() != true { 37 t.Fatal("ValueOf(true).Bool() = false") 38 } 39} 40 41type integer int 42type T struct { 43 a int 44 b float64 45 c string 46 d *int 47} 48 49type pair struct { 50 i any 51 s string 52} 53 54func assert(t *testing.T, s, want string) { 55 if s != want { 56 t.Errorf("have %#q want %#q", s, want) 57 } 58} 59 60var typeTests = []pair{ 61 {struct{ x int }{}, "int"}, 62 {struct{ x int8 }{}, "int8"}, 63 {struct{ x int16 }{}, "int16"}, 64 {struct{ x int32 }{}, "int32"}, 65 {struct{ x int64 }{}, "int64"}, 66 {struct{ x uint }{}, "uint"}, 67 {struct{ x uint8 }{}, "uint8"}, 68 {struct{ x uint16 }{}, "uint16"}, 69 {struct{ x uint32 }{}, "uint32"}, 70 {struct{ x uint64 }{}, "uint64"}, 71 {struct{ x float32 }{}, "float32"}, 72 {struct{ x float64 }{}, "float64"}, 73 {struct{ x int8 }{}, "int8"}, 74 {struct{ x (**int8) }{}, "**int8"}, 75 {struct{ x (**integer) }{}, "**reflect_test.integer"}, 76 {struct{ x ([32]int32) }{}, "[32]int32"}, 77 {struct{ x ([]int8) }{}, "[]int8"}, 78 {struct{ x (map[string]int32) }{}, "map[string]int32"}, 79 {struct{ x (chan<- string) }{}, "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{ x (chan (<-chan string)) }{}, "chan (<-chan string)"}, 84 {struct { 85 x struct { 86 c chan *int32 87 d float32 88 } 89 }{}, 90 "struct { c chan *int32; d float32 }", 91 }, 92 {struct{ x (func(a int8, b int32)) }{}, "func(int8, int32)"}, 93 {struct { 94 x struct { 95 c func(chan *integer, *int8) 96 } 97 }{}, 98 "struct { c func(chan *reflect_test.integer, *int8) }", 99 }, 100 {struct { 101 x struct { 102 a int8 103 b int32 104 } 105 }{}, 106 "struct { a int8; b int32 }", 107 }, 108 {struct { 109 x struct { 110 a int8 111 b int8 112 c int32 113 } 114 }{}, 115 "struct { a int8; b int8; c int32 }", 116 }, 117 {struct { 118 x struct { 119 a int8 120 b int8 121 c int8 122 d int32 123 } 124 }{}, 125 "struct { a int8; b int8; c int8; d int32 }", 126 }, 127 {struct { 128 x struct { 129 a int8 130 b int8 131 c int8 132 d int8 133 e int32 134 } 135 }{}, 136 "struct { a int8; b int8; c int8; d int8; e int32 }", 137 }, 138 {struct { 139 x struct { 140 a int8 141 b int8 142 c int8 143 d int8 144 e int8 145 f int32 146 } 147 }{}, 148 "struct { a int8; b int8; c int8; d int8; e int8; f int32 }", 149 }, 150 {struct { 151 x struct { 152 a int8 `reflect:"hi there"` 153 } 154 }{}, 155 `struct { a int8 "reflect:\"hi there\"" }`, 156 }, 157 {struct { 158 x struct { 159 a int8 `reflect:"hi \x00there\t\n\"\\"` 160 } 161 }{}, 162 `struct { a int8 "reflect:\"hi \\x00there\\t\\n\\\"\\\\\"" }`, 163 }, 164 {struct { 165 x struct { 166 f func(args ...int) 167 } 168 }{}, 169 "struct { f func(...int) }", 170 }, 171 {struct { 172 x (interface { 173 a(func(func(int) int) func(func(int)) int) 174 b() 175 }) 176 }{}, 177 "interface { reflect_test.a(func(func(int) int) func(func(int)) int); reflect_test.b() }", 178 }, 179 {struct { 180 x struct { 181 int32 182 int64 183 } 184 }{}, 185 "struct { int32; int64 }", 186 }, 187} 188 189var valueTests = []pair{ 190 {new(int), "132"}, 191 {new(int8), "8"}, 192 {new(int16), "16"}, 193 {new(int32), "32"}, 194 {new(int64), "64"}, 195 {new(uint), "132"}, 196 {new(uint8), "8"}, 197 {new(uint16), "16"}, 198 {new(uint32), "32"}, 199 {new(uint64), "64"}, 200 {new(float32), "256.25"}, 201 {new(float64), "512.125"}, 202 {new(complex64), "532.125+10i"}, 203 {new(complex128), "564.25+1i"}, 204 {new(string), "stringy cheese"}, 205 {new(bool), "true"}, 206 {new(*int8), "*int8(0)"}, 207 {new(**int8), "**int8(0)"}, 208 {new([5]int32), "[5]int32{0, 0, 0, 0, 0}"}, 209 {new(**integer), "**reflect_test.integer(0)"}, 210 {new(map[string]int32), "map[string]int32{<can't iterate on maps>}"}, 211 {new(chan<- string), "chan<- string"}, 212 {new(func(a int8, b int32)), "func(int8, int32)(0)"}, 213 {new(struct { 214 c chan *int32 215 d float32 216 }), 217 "struct { c chan *int32; d float32 }{chan *int32, 0}", 218 }, 219 {new(struct{ c func(chan *integer, *int8) }), 220 "struct { c func(chan *reflect_test.integer, *int8) }{func(chan *reflect_test.integer, *int8)(0)}", 221 }, 222 {new(struct { 223 a int8 224 b int32 225 }), 226 "struct { a int8; b int32 }{0, 0}", 227 }, 228 {new(struct { 229 a int8 230 b int8 231 c int32 232 }), 233 "struct { a int8; b int8; c int32 }{0, 0, 0}", 234 }, 235} 236 237func testType(t *testing.T, i int, typ Type, want string) { 238 s := typ.String() 239 if s != want { 240 t.Errorf("#%d: have %#q, want %#q", i, s, want) 241 } 242} 243 244func TestTypes(t *testing.T) { 245 for i, tt := range typeTests { 246 testType(t, i, ValueOf(tt.i).Field(0).Type(), tt.s) 247 } 248} 249 250func TestSet(t *testing.T) { 251 for i, tt := range valueTests { 252 v := ValueOf(tt.i) 253 v = v.Elem() 254 switch v.Kind() { 255 case Int: 256 v.SetInt(132) 257 case Int8: 258 v.SetInt(8) 259 case Int16: 260 v.SetInt(16) 261 case Int32: 262 v.SetInt(32) 263 case Int64: 264 v.SetInt(64) 265 case Uint: 266 v.SetUint(132) 267 case Uint8: 268 v.SetUint(8) 269 case Uint16: 270 v.SetUint(16) 271 case Uint32: 272 v.SetUint(32) 273 case Uint64: 274 v.SetUint(64) 275 case Float32: 276 v.SetFloat(256.25) 277 case Float64: 278 v.SetFloat(512.125) 279 case Complex64: 280 v.SetComplex(532.125 + 10i) 281 case Complex128: 282 v.SetComplex(564.25 + 1i) 283 case String: 284 v.SetString("stringy cheese") 285 case Bool: 286 v.SetBool(true) 287 } 288 s := valueToString(v) 289 if s != tt.s { 290 t.Errorf("#%d: have %#q, want %#q", i, s, tt.s) 291 } 292 } 293} 294 295func TestSetValue(t *testing.T) { 296 for i, tt := range valueTests { 297 v := ValueOf(tt.i).Elem() 298 switch v.Kind() { 299 case Int: 300 v.Set(ValueOf(int(132))) 301 case Int8: 302 v.Set(ValueOf(int8(8))) 303 case Int16: 304 v.Set(ValueOf(int16(16))) 305 case Int32: 306 v.Set(ValueOf(int32(32))) 307 case Int64: 308 v.Set(ValueOf(int64(64))) 309 case Uint: 310 v.Set(ValueOf(uint(132))) 311 case Uint8: 312 v.Set(ValueOf(uint8(8))) 313 case Uint16: 314 v.Set(ValueOf(uint16(16))) 315 case Uint32: 316 v.Set(ValueOf(uint32(32))) 317 case Uint64: 318 v.Set(ValueOf(uint64(64))) 319 case Float32: 320 v.Set(ValueOf(float32(256.25))) 321 case Float64: 322 v.Set(ValueOf(512.125)) 323 case Complex64: 324 v.Set(ValueOf(complex64(532.125 + 10i))) 325 case Complex128: 326 v.Set(ValueOf(complex128(564.25 + 1i))) 327 case String: 328 v.Set(ValueOf("stringy cheese")) 329 case Bool: 330 v.Set(ValueOf(true)) 331 } 332 s := valueToString(v) 333 if s != tt.s { 334 t.Errorf("#%d: have %#q, want %#q", i, s, tt.s) 335 } 336 } 337} 338 339func TestMapIterSet(t *testing.T) { 340 m := make(map[string]any, len(valueTests)) 341 for _, tt := range valueTests { 342 m[tt.s] = tt.i 343 } 344 v := ValueOf(m) 345 346 k := New(v.Type().Key()).Elem() 347 e := New(v.Type().Elem()).Elem() 348 349 iter := v.MapRange() 350 for iter.Next() { 351 k.SetIterKey(iter) 352 e.SetIterValue(iter) 353 want := m[k.String()] 354 got := e.Interface() 355 if got != want { 356 t.Errorf("%q: want (%T) %v, got (%T) %v", k.String(), want, want, got, got) 357 } 358 if setkey, key := valueToString(k), valueToString(iter.Key()); setkey != key { 359 t.Errorf("MapIter.Key() = %q, MapIter.SetKey() = %q", key, setkey) 360 } 361 if setval, val := valueToString(e), valueToString(iter.Value()); setval != val { 362 t.Errorf("MapIter.Value() = %q, MapIter.SetValue() = %q", val, setval) 363 } 364 } 365 366 got := int(testing.AllocsPerRun(10, func() { 367 iter := v.MapRange() 368 for iter.Next() { 369 k.SetIterKey(iter) 370 e.SetIterValue(iter) 371 } 372 })) 373 // Making a *MapIter allocates. This should be the only allocation. 374 if got != 1 { 375 t.Errorf("wanted 1 alloc, got %d", got) 376 } 377} 378 379func TestCanIntUintFloatComplex(t *testing.T) { 380 type integer int 381 type uinteger uint 382 type float float64 383 type complex complex128 384 385 var ops = [...]string{"CanInt", "CanUint", "CanFloat", "CanComplex"} 386 387 var testCases = []struct { 388 i any 389 want [4]bool 390 }{ 391 // signed integer 392 {132, [...]bool{true, false, false, false}}, 393 {int8(8), [...]bool{true, false, false, false}}, 394 {int16(16), [...]bool{true, false, false, false}}, 395 {int32(32), [...]bool{true, false, false, false}}, 396 {int64(64), [...]bool{true, false, false, false}}, 397 // unsigned integer 398 {uint(132), [...]bool{false, true, false, false}}, 399 {uint8(8), [...]bool{false, true, false, false}}, 400 {uint16(16), [...]bool{false, true, false, false}}, 401 {uint32(32), [...]bool{false, true, false, false}}, 402 {uint64(64), [...]bool{false, true, false, false}}, 403 {uintptr(0xABCD), [...]bool{false, true, false, false}}, 404 // floating-point 405 {float32(256.25), [...]bool{false, false, true, false}}, 406 {float64(512.125), [...]bool{false, false, true, false}}, 407 // complex 408 {complex64(532.125 + 10i), [...]bool{false, false, false, true}}, 409 {complex128(564.25 + 1i), [...]bool{false, false, false, true}}, 410 // underlying 411 {integer(-132), [...]bool{true, false, false, false}}, 412 {uinteger(132), [...]bool{false, true, false, false}}, 413 {float(256.25), [...]bool{false, false, true, false}}, 414 {complex(532.125 + 10i), [...]bool{false, false, false, true}}, 415 // not-acceptable 416 {"hello world", [...]bool{false, false, false, false}}, 417 {new(int), [...]bool{false, false, false, false}}, 418 {new(uint), [...]bool{false, false, false, false}}, 419 {new(float64), [...]bool{false, false, false, false}}, 420 {new(complex64), [...]bool{false, false, false, false}}, 421 {new([5]int), [...]bool{false, false, false, false}}, 422 {new(integer), [...]bool{false, false, false, false}}, 423 {new(map[int]int), [...]bool{false, false, false, false}}, 424 {new(chan<- int), [...]bool{false, false, false, false}}, 425 {new(func(a int8)), [...]bool{false, false, false, false}}, 426 {new(struct{ i int }), [...]bool{false, false, false, false}}, 427 } 428 429 for i, tc := range testCases { 430 v := ValueOf(tc.i) 431 got := [...]bool{v.CanInt(), v.CanUint(), v.CanFloat(), v.CanComplex()} 432 433 for j := range tc.want { 434 if got[j] != tc.want[j] { 435 t.Errorf( 436 "#%d: v.%s() returned %t for type %T, want %t", 437 i, 438 ops[j], 439 got[j], 440 tc.i, 441 tc.want[j], 442 ) 443 } 444 } 445 } 446} 447 448func TestCanSetField(t *testing.T) { 449 type embed struct{ x, X int } 450 type Embed struct{ x, X int } 451 type S1 struct { 452 embed 453 x, X int 454 } 455 type S2 struct { 456 *embed 457 x, X int 458 } 459 type S3 struct { 460 Embed 461 x, X int 462 } 463 type S4 struct { 464 *Embed 465 x, X int 466 } 467 468 type testCase struct { 469 // -1 means Addr().Elem() of current value 470 index []int 471 canSet bool 472 } 473 tests := []struct { 474 val Value 475 cases []testCase 476 }{{ 477 val: ValueOf(&S1{}), 478 cases: []testCase{ 479 {[]int{0}, false}, 480 {[]int{0, -1}, false}, 481 {[]int{0, 0}, false}, 482 {[]int{0, 0, -1}, false}, 483 {[]int{0, -1, 0}, false}, 484 {[]int{0, -1, 0, -1}, false}, 485 {[]int{0, 1}, true}, 486 {[]int{0, 1, -1}, true}, 487 {[]int{0, -1, 1}, true}, 488 {[]int{0, -1, 1, -1}, true}, 489 {[]int{1}, false}, 490 {[]int{1, -1}, false}, 491 {[]int{2}, true}, 492 {[]int{2, -1}, true}, 493 }, 494 }, { 495 val: ValueOf(&S2{embed: &embed{}}), 496 cases: []testCase{ 497 {[]int{0}, false}, 498 {[]int{0, -1}, false}, 499 {[]int{0, 0}, false}, 500 {[]int{0, 0, -1}, false}, 501 {[]int{0, -1, 0}, false}, 502 {[]int{0, -1, 0, -1}, false}, 503 {[]int{0, 1}, true}, 504 {[]int{0, 1, -1}, true}, 505 {[]int{0, -1, 1}, true}, 506 {[]int{0, -1, 1, -1}, true}, 507 {[]int{1}, false}, 508 {[]int{2}, true}, 509 }, 510 }, { 511 val: ValueOf(&S3{}), 512 cases: []testCase{ 513 {[]int{0}, true}, 514 {[]int{0, -1}, true}, 515 {[]int{0, 0}, false}, 516 {[]int{0, 0, -1}, false}, 517 {[]int{0, -1, 0}, false}, 518 {[]int{0, -1, 0, -1}, false}, 519 {[]int{0, 1}, true}, 520 {[]int{0, 1, -1}, true}, 521 {[]int{0, -1, 1}, true}, 522 {[]int{0, -1, 1, -1}, true}, 523 {[]int{1}, false}, 524 {[]int{2}, true}, 525 }, 526 }, { 527 val: ValueOf(&S4{Embed: &Embed{}}), 528 cases: []testCase{ 529 {[]int{0}, true}, 530 {[]int{0, -1}, true}, 531 {[]int{0, 0}, false}, 532 {[]int{0, 0, -1}, false}, 533 {[]int{0, -1, 0}, false}, 534 {[]int{0, -1, 0, -1}, false}, 535 {[]int{0, 1}, true}, 536 {[]int{0, 1, -1}, true}, 537 {[]int{0, -1, 1}, true}, 538 {[]int{0, -1, 1, -1}, true}, 539 {[]int{1}, false}, 540 {[]int{2}, true}, 541 }, 542 }} 543 544 for _, tt := range tests { 545 t.Run(tt.val.Type().Name(), func(t *testing.T) { 546 for _, tc := range tt.cases { 547 f := tt.val 548 for _, i := range tc.index { 549 if f.Kind() == Pointer { 550 f = f.Elem() 551 } 552 if i == -1 { 553 f = f.Addr().Elem() 554 } else { 555 f = f.Field(i) 556 } 557 } 558 if got := f.CanSet(); got != tc.canSet { 559 t.Errorf("CanSet() = %v, want %v", got, tc.canSet) 560 } 561 } 562 }) 563 } 564} 565 566var _i = 7 567 568var valueToStringTests = []pair{ 569 {123, "123"}, 570 {123.5, "123.5"}, 571 {byte(123), "123"}, 572 {"abc", "abc"}, 573 {T{123, 456.75, "hello", &_i}, "reflect_test.T{123, 456.75, hello, *int(&7)}"}, 574 {new(chan *T), "*chan *reflect_test.T(&chan *reflect_test.T)"}, 575 {[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"}, 576 {&[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})"}, 577 {[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"}, 578 {&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[]int(&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"}, 579} 580 581func TestValueToString(t *testing.T) { 582 for i, test := range valueToStringTests { 583 s := valueToString(ValueOf(test.i)) 584 if s != test.s { 585 t.Errorf("#%d: have %#q, want %#q", i, s, test.s) 586 } 587 } 588} 589 590func TestArrayElemSet(t *testing.T) { 591 v := ValueOf(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}).Elem() 592 v.Index(4).SetInt(123) 593 s := valueToString(v) 594 const want = "[10]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}" 595 if s != want { 596 t.Errorf("[10]int: have %#q want %#q", s, want) 597 } 598 599 v = ValueOf([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}) 600 v.Index(4).SetInt(123) 601 s = valueToString(v) 602 const want1 = "[]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}" 603 if s != want1 { 604 t.Errorf("[]int: have %#q want %#q", s, want1) 605 } 606} 607 608func TestPtrPointTo(t *testing.T) { 609 var ip *int32 610 var i int32 = 1234 611 vip := ValueOf(&ip) 612 vi := ValueOf(&i).Elem() 613 vip.Elem().Set(vi.Addr()) 614 if *ip != 1234 { 615 t.Errorf("got %d, want 1234", *ip) 616 } 617 618 ip = nil 619 vp := ValueOf(&ip).Elem() 620 vp.Set(Zero(vp.Type())) 621 if ip != nil { 622 t.Errorf("got non-nil (%p), want nil", ip) 623 } 624} 625 626func TestPtrSetNil(t *testing.T) { 627 var i int32 = 1234 628 ip := &i 629 vip := ValueOf(&ip) 630 vip.Elem().Set(Zero(vip.Elem().Type())) 631 if ip != nil { 632 t.Errorf("got non-nil (%d), want nil", *ip) 633 } 634} 635 636func TestMapSetNil(t *testing.T) { 637 m := make(map[string]int) 638 vm := ValueOf(&m) 639 vm.Elem().Set(Zero(vm.Elem().Type())) 640 if m != nil { 641 t.Errorf("got non-nil (%p), want nil", m) 642 } 643} 644 645func TestAll(t *testing.T) { 646 testType(t, 1, TypeOf((int8)(0)), "int8") 647 testType(t, 2, TypeOf((*int8)(nil)).Elem(), "int8") 648 649 typ := TypeOf((*struct { 650 c chan *int32 651 d float32 652 })(nil)) 653 testType(t, 3, typ, "*struct { c chan *int32; d float32 }") 654 etyp := typ.Elem() 655 testType(t, 4, etyp, "struct { c chan *int32; d float32 }") 656 styp := etyp 657 f := styp.Field(0) 658 testType(t, 5, f.Type, "chan *int32") 659 660 f, present := styp.FieldByName("d") 661 if !present { 662 t.Errorf("FieldByName says present field is absent") 663 } 664 testType(t, 6, f.Type, "float32") 665 666 f, present = styp.FieldByName("absent") 667 if present { 668 t.Errorf("FieldByName says absent field is present") 669 } 670 671 typ = TypeOf([32]int32{}) 672 testType(t, 7, typ, "[32]int32") 673 testType(t, 8, typ.Elem(), "int32") 674 675 typ = TypeOf((map[string]*int32)(nil)) 676 testType(t, 9, typ, "map[string]*int32") 677 mtyp := typ 678 testType(t, 10, mtyp.Key(), "string") 679 testType(t, 11, mtyp.Elem(), "*int32") 680 681 typ = TypeOf((chan<- string)(nil)) 682 testType(t, 12, typ, "chan<- string") 683 testType(t, 13, typ.Elem(), "string") 684 685 // make sure tag strings are not part of element type 686 typ = TypeOf(struct { 687 d []uint32 `reflect:"TAG"` 688 }{}).Field(0).Type 689 testType(t, 14, typ, "[]uint32") 690} 691 692func TestInterfaceGet(t *testing.T) { 693 var inter struct { 694 E any 695 } 696 inter.E = 123.456 697 v1 := ValueOf(&inter) 698 v2 := v1.Elem().Field(0) 699 assert(t, v2.Type().String(), "interface {}") 700 i2 := v2.Interface() 701 v3 := ValueOf(i2) 702 assert(t, v3.Type().String(), "float64") 703} 704 705func TestInterfaceValue(t *testing.T) { 706 var inter struct { 707 E any 708 } 709 inter.E = 123.456 710 v1 := ValueOf(&inter) 711 v2 := v1.Elem().Field(0) 712 assert(t, v2.Type().String(), "interface {}") 713 v3 := v2.Elem() 714 assert(t, v3.Type().String(), "float64") 715 716 i3 := v2.Interface() 717 if _, ok := i3.(float64); !ok { 718 t.Error("v2.Interface() did not return float64, got ", TypeOf(i3)) 719 } 720} 721 722func TestFunctionValue(t *testing.T) { 723 var x any = func() {} 724 v := ValueOf(x) 725 if fmt.Sprint(v.Interface()) != fmt.Sprint(x) { 726 t.Fatalf("TestFunction returned wrong pointer") 727 } 728 assert(t, v.Type().String(), "func()") 729} 730 731var appendTests = []struct { 732 orig, extra []int 733}{ 734 {make([]int, 2, 4), []int{22}}, 735 {make([]int, 2, 4), []int{22, 33, 44}}, 736} 737 738func sameInts(x, y []int) bool { 739 if len(x) != len(y) { 740 return false 741 } 742 for i, xx := range x { 743 if xx != y[i] { 744 return false 745 } 746 } 747 return true 748} 749 750func TestAppend(t *testing.T) { 751 for i, test := range appendTests { 752 origLen, extraLen := len(test.orig), len(test.extra) 753 want := append(test.orig, test.extra...) 754 // Convert extra from []int to []Value. 755 e0 := make([]Value, len(test.extra)) 756 for j, e := range test.extra { 757 e0[j] = ValueOf(e) 758 } 759 // Convert extra from []int to *SliceValue. 760 e1 := ValueOf(test.extra) 761 // Test Append. 762 a0 := ValueOf(test.orig) 763 have0 := Append(a0, e0...).Interface().([]int) 764 if !sameInts(have0, want) { 765 t.Errorf("Append #%d: have %v, want %v (%p %p)", i, have0, want, test.orig, have0) 766 } 767 // Check that the orig and extra slices were not modified. 768 if len(test.orig) != origLen { 769 t.Errorf("Append #%d origLen: have %v, want %v", i, len(test.orig), origLen) 770 } 771 if len(test.extra) != extraLen { 772 t.Errorf("Append #%d extraLen: have %v, want %v", i, len(test.extra), extraLen) 773 } 774 // Test AppendSlice. 775 a1 := ValueOf(test.orig) 776 have1 := AppendSlice(a1, e1).Interface().([]int) 777 if !sameInts(have1, want) { 778 t.Errorf("AppendSlice #%d: have %v, want %v", i, have1, want) 779 } 780 // Check that the orig and extra slices were not modified. 781 if len(test.orig) != origLen { 782 t.Errorf("AppendSlice #%d origLen: have %v, want %v", i, len(test.orig), origLen) 783 } 784 if len(test.extra) != extraLen { 785 t.Errorf("AppendSlice #%d extraLen: have %v, want %v", i, len(test.extra), extraLen) 786 } 787 } 788} 789 790func TestCopy(t *testing.T) { 791 a := []int{1, 2, 3, 4, 10, 9, 8, 7} 792 b := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} 793 c := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} 794 for i := 0; i < len(b); i++ { 795 if b[i] != c[i] { 796 t.Fatalf("b != c before test") 797 } 798 } 799 a1 := a 800 b1 := b 801 aa := ValueOf(&a1).Elem() 802 ab := ValueOf(&b1).Elem() 803 for tocopy := 1; tocopy <= 7; tocopy++ { 804 aa.SetLen(tocopy) 805 Copy(ab, aa) 806 aa.SetLen(8) 807 for i := 0; i < tocopy; i++ { 808 if a[i] != b[i] { 809 t.Errorf("(i) tocopy=%d a[%d]=%d, b[%d]=%d", 810 tocopy, i, a[i], i, b[i]) 811 } 812 } 813 for i := tocopy; i < len(b); i++ { 814 if b[i] != c[i] { 815 if i < len(a) { 816 t.Errorf("(ii) tocopy=%d a[%d]=%d, b[%d]=%d, c[%d]=%d", 817 tocopy, i, a[i], i, b[i], i, c[i]) 818 } else { 819 t.Errorf("(iii) tocopy=%d b[%d]=%d, c[%d]=%d", 820 tocopy, i, b[i], i, c[i]) 821 } 822 } else { 823 t.Logf("tocopy=%d elem %d is okay\n", tocopy, i) 824 } 825 } 826 } 827} 828 829func TestCopyString(t *testing.T) { 830 t.Run("Slice", func(t *testing.T) { 831 s := bytes.Repeat([]byte{'_'}, 8) 832 val := ValueOf(s) 833 834 n := Copy(val, ValueOf("")) 835 if expecting := []byte("________"); n != 0 || !bytes.Equal(s, expecting) { 836 t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s, expecting) 837 } 838 839 n = Copy(val, ValueOf("hello")) 840 if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s, expecting) { 841 t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s, expecting) 842 } 843 844 n = Copy(val, ValueOf("helloworld")) 845 if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s, expecting) { 846 t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s, expecting) 847 } 848 }) 849 t.Run("Array", func(t *testing.T) { 850 s := [...]byte{'_', '_', '_', '_', '_', '_', '_', '_'} 851 val := ValueOf(&s).Elem() 852 853 n := Copy(val, ValueOf("")) 854 if expecting := []byte("________"); n != 0 || !bytes.Equal(s[:], expecting) { 855 t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s[:], expecting) 856 } 857 858 n = Copy(val, ValueOf("hello")) 859 if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s[:], expecting) { 860 t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s[:], expecting) 861 } 862 863 n = Copy(val, ValueOf("helloworld")) 864 if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s[:], expecting) { 865 t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s[:], expecting) 866 } 867 }) 868} 869 870func TestCopyArray(t *testing.T) { 871 a := [8]int{1, 2, 3, 4, 10, 9, 8, 7} 872 b := [11]int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} 873 c := b 874 aa := ValueOf(&a).Elem() 875 ab := ValueOf(&b).Elem() 876 Copy(ab, aa) 877 for i := 0; i < len(a); i++ { 878 if a[i] != b[i] { 879 t.Errorf("(i) a[%d]=%d, b[%d]=%d", i, a[i], i, b[i]) 880 } 881 } 882 for i := len(a); i < len(b); i++ { 883 if b[i] != c[i] { 884 t.Errorf("(ii) b[%d]=%d, c[%d]=%d", i, b[i], i, c[i]) 885 } else { 886 t.Logf("elem %d is okay\n", i) 887 } 888 } 889} 890 891func TestBigUnnamedStruct(t *testing.T) { 892 b := struct{ a, b, c, d int64 }{1, 2, 3, 4} 893 v := ValueOf(b) 894 b1 := v.Interface().(struct { 895 a, b, c, d int64 896 }) 897 if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d { 898 t.Errorf("ValueOf(%v).Interface().(*Big) = %v", b, b1) 899 } 900} 901 902type big struct { 903 a, b, c, d, e int64 904} 905 906func TestBigStruct(t *testing.T) { 907 b := big{1, 2, 3, 4, 5} 908 v := ValueOf(b) 909 b1 := v.Interface().(big) 910 if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d || b1.e != b.e { 911 t.Errorf("ValueOf(%v).Interface().(big) = %v", b, b1) 912 } 913} 914 915type Basic struct { 916 x int 917 y float32 918} 919 920type NotBasic Basic 921 922type DeepEqualTest struct { 923 a, b any 924 eq bool 925} 926 927// Simple functions for DeepEqual tests. 928var ( 929 fn1 func() // nil. 930 fn2 func() // nil. 931 fn3 = func() { fn1() } // Not nil. 932) 933 934type self struct{} 935 936type Loop *Loop 937type Loopy any 938 939var loop1, loop2 Loop 940var loopy1, loopy2 Loopy 941var cycleMap1, cycleMap2, cycleMap3 map[string]any 942 943type structWithSelfPtr struct { 944 p *structWithSelfPtr 945 s string 946} 947 948func init() { 949 loop1 = &loop2 950 loop2 = &loop1 951 952 loopy1 = &loopy2 953 loopy2 = &loopy1 954 955 cycleMap1 = map[string]any{} 956 cycleMap1["cycle"] = cycleMap1 957 cycleMap2 = map[string]any{} 958 cycleMap2["cycle"] = cycleMap2 959 cycleMap3 = map[string]any{} 960 cycleMap3["different"] = cycleMap3 961} 962 963var deepEqualTests = []DeepEqualTest{ 964 // Equalities 965 {nil, nil, true}, 966 {1, 1, true}, 967 {int32(1), int32(1), true}, 968 {0.5, 0.5, true}, 969 {float32(0.5), float32(0.5), true}, 970 {"hello", "hello", true}, 971 {make([]int, 10), make([]int, 10), true}, 972 {&[3]int{1, 2, 3}, &[3]int{1, 2, 3}, true}, 973 {Basic{1, 0.5}, Basic{1, 0.5}, true}, 974 {error(nil), error(nil), true}, 975 {map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, true}, 976 {fn1, fn2, true}, 977 {[]byte{1, 2, 3}, []byte{1, 2, 3}, true}, 978 {[]MyByte{1, 2, 3}, []MyByte{1, 2, 3}, true}, 979 {MyBytes{1, 2, 3}, MyBytes{1, 2, 3}, true}, 980 981 // Inequalities 982 {1, 2, false}, 983 {int32(1), int32(2), false}, 984 {0.5, 0.6, false}, 985 {float32(0.5), float32(0.6), false}, 986 {"hello", "hey", false}, 987 {make([]int, 10), make([]int, 11), false}, 988 {&[3]int{1, 2, 3}, &[3]int{1, 2, 4}, false}, 989 {Basic{1, 0.5}, Basic{1, 0.6}, false}, 990 {Basic{1, 0}, Basic{2, 0}, false}, 991 {map[int]string{1: "one", 3: "two"}, map[int]string{2: "two", 1: "one"}, false}, 992 {map[int]string{1: "one", 2: "txo"}, map[int]string{2: "two", 1: "one"}, false}, 993 {map[int]string{1: "one"}, map[int]string{2: "two", 1: "one"}, false}, 994 {map[int]string{2: "two", 1: "one"}, map[int]string{1: "one"}, false}, 995 {nil, 1, false}, 996 {1, nil, false}, 997 {fn1, fn3, false}, 998 {fn3, fn3, false}, 999 {[][]int{{1}}, [][]int{{2}}, false}, 1000 {&structWithSelfPtr{p: &structWithSelfPtr{s: "a"}}, &structWithSelfPtr{p: &structWithSelfPtr{s: "b"}}, false}, 1001 1002 // Fun with floating point. 1003 {math.NaN(), math.NaN(), false}, 1004 {&[1]float64{math.NaN()}, &[1]float64{math.NaN()}, false}, 1005 {&[1]float64{math.NaN()}, self{}, true}, 1006 {[]float64{math.NaN()}, []float64{math.NaN()}, false}, 1007 {[]float64{math.NaN()}, self{}, true}, 1008 {map[float64]float64{math.NaN(): 1}, map[float64]float64{1: 2}, false}, 1009 {map[float64]float64{math.NaN(): 1}, self{}, true}, 1010 1011 // Nil vs empty: not the same. 1012 {[]int{}, []int(nil), false}, 1013 {[]int{}, []int{}, true}, 1014 {[]int(nil), []int(nil), true}, 1015 {map[int]int{}, map[int]int(nil), false}, 1016 {map[int]int{}, map[int]int{}, true}, 1017 {map[int]int(nil), map[int]int(nil), true}, 1018 1019 // Mismatched types 1020 {1, 1.0, false}, 1021 {int32(1), int64(1), false}, 1022 {0.5, "hello", false}, 1023 {[]int{1, 2, 3}, [3]int{1, 2, 3}, false}, 1024 {&[3]any{1, 2, 4}, &[3]any{1, 2, "s"}, false}, 1025 {Basic{1, 0.5}, NotBasic{1, 0.5}, false}, 1026 {map[uint]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, false}, 1027 {[]byte{1, 2, 3}, []MyByte{1, 2, 3}, false}, 1028 {[]MyByte{1, 2, 3}, MyBytes{1, 2, 3}, false}, 1029 {[]byte{1, 2, 3}, MyBytes{1, 2, 3}, false}, 1030 1031 // Possible loops. 1032 {&loop1, &loop1, true}, 1033 {&loop1, &loop2, true}, 1034 {&loopy1, &loopy1, true}, 1035 {&loopy1, &loopy2, true}, 1036 {&cycleMap1, &cycleMap2, true}, 1037 {&cycleMap1, &cycleMap3, false}, 1038} 1039 1040func TestDeepEqual(t *testing.T) { 1041 for _, test := range deepEqualTests { 1042 if test.b == (self{}) { 1043 test.b = test.a 1044 } 1045 if r := DeepEqual(test.a, test.b); r != test.eq { 1046 t.Errorf("DeepEqual(%#v, %#v) = %v, want %v", test.a, test.b, r, test.eq) 1047 } 1048 } 1049} 1050 1051func TestTypeOf(t *testing.T) { 1052 // Special case for nil 1053 if typ := TypeOf(nil); typ != nil { 1054 t.Errorf("expected nil type for nil value; got %v", typ) 1055 } 1056 for _, test := range deepEqualTests { 1057 v := ValueOf(test.a) 1058 if !v.IsValid() { 1059 continue 1060 } 1061 typ := TypeOf(test.a) 1062 if typ != v.Type() { 1063 t.Errorf("TypeOf(%v) = %v, but ValueOf(%v).Type() = %v", test.a, typ, test.a, v.Type()) 1064 } 1065 } 1066} 1067 1068type Recursive struct { 1069 x int 1070 r *Recursive 1071} 1072 1073func TestDeepEqualRecursiveStruct(t *testing.T) { 1074 a, b := new(Recursive), new(Recursive) 1075 *a = Recursive{12, a} 1076 *b = Recursive{12, b} 1077 if !DeepEqual(a, b) { 1078 t.Error("DeepEqual(recursive same) = false, want true") 1079 } 1080} 1081 1082type _Complex struct { 1083 a int 1084 b [3]*_Complex 1085 c *string 1086 d map[float64]float64 1087} 1088 1089func TestDeepEqualComplexStruct(t *testing.T) { 1090 m := make(map[float64]float64) 1091 stra, strb := "hello", "hello" 1092 a, b := new(_Complex), new(_Complex) 1093 *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m} 1094 *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m} 1095 if !DeepEqual(a, b) { 1096 t.Error("DeepEqual(complex same) = false, want true") 1097 } 1098} 1099 1100func TestDeepEqualComplexStructInequality(t *testing.T) { 1101 m := make(map[float64]float64) 1102 stra, strb := "hello", "helloo" // Difference is here 1103 a, b := new(_Complex), new(_Complex) 1104 *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m} 1105 *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m} 1106 if DeepEqual(a, b) { 1107 t.Error("DeepEqual(complex different) = true, want false") 1108 } 1109} 1110 1111type UnexpT struct { 1112 m map[int]int 1113} 1114 1115func TestDeepEqualUnexportedMap(t *testing.T) { 1116 // Check that DeepEqual can look at unexported fields. 1117 x1 := UnexpT{map[int]int{1: 2}} 1118 x2 := UnexpT{map[int]int{1: 2}} 1119 if !DeepEqual(&x1, &x2) { 1120 t.Error("DeepEqual(x1, x2) = false, want true") 1121 } 1122 1123 y1 := UnexpT{map[int]int{2: 3}} 1124 if DeepEqual(&x1, &y1) { 1125 t.Error("DeepEqual(x1, y1) = true, want false") 1126 } 1127} 1128 1129var deepEqualPerfTests = []struct { 1130 x, y any 1131}{ 1132 {x: int8(99), y: int8(99)}, 1133 {x: []int8{99}, y: []int8{99}}, 1134 {x: int16(99), y: int16(99)}, 1135 {x: []int16{99}, y: []int16{99}}, 1136 {x: int32(99), y: int32(99)}, 1137 {x: []int32{99}, y: []int32{99}}, 1138 {x: int64(99), y: int64(99)}, 1139 {x: []int64{99}, y: []int64{99}}, 1140 {x: int(999999), y: int(999999)}, 1141 {x: []int{999999}, y: []int{999999}}, 1142 1143 {x: uint8(99), y: uint8(99)}, 1144 {x: []uint8{99}, y: []uint8{99}}, 1145 {x: uint16(99), y: uint16(99)}, 1146 {x: []uint16{99}, y: []uint16{99}}, 1147 {x: uint32(99), y: uint32(99)}, 1148 {x: []uint32{99}, y: []uint32{99}}, 1149 {x: uint64(99), y: uint64(99)}, 1150 {x: []uint64{99}, y: []uint64{99}}, 1151 {x: uint(999999), y: uint(999999)}, 1152 {x: []uint{999999}, y: []uint{999999}}, 1153 {x: uintptr(999999), y: uintptr(999999)}, 1154 {x: []uintptr{999999}, y: []uintptr{999999}}, 1155 1156 {x: float32(1.414), y: float32(1.414)}, 1157 {x: []float32{1.414}, y: []float32{1.414}}, 1158 {x: float64(1.414), y: float64(1.414)}, 1159 {x: []float64{1.414}, y: []float64{1.414}}, 1160 1161 {x: complex64(1.414), y: complex64(1.414)}, 1162 {x: []complex64{1.414}, y: []complex64{1.414}}, 1163 {x: complex128(1.414), y: complex128(1.414)}, 1164 {x: []complex128{1.414}, y: []complex128{1.414}}, 1165 1166 {x: true, y: true}, 1167 {x: []bool{true}, y: []bool{true}}, 1168 1169 {x: "abcdef", y: "abcdef"}, 1170 {x: []string{"abcdef"}, y: []string{"abcdef"}}, 1171 1172 {x: []byte("abcdef"), y: []byte("abcdef")}, 1173 {x: [][]byte{[]byte("abcdef")}, y: [][]byte{[]byte("abcdef")}}, 1174 1175 {x: [6]byte{'a', 'b', 'c', 'a', 'b', 'c'}, y: [6]byte{'a', 'b', 'c', 'a', 'b', 'c'}}, 1176 {x: [][6]byte{[6]byte{'a', 'b', 'c', 'a', 'b', 'c'}}, y: [][6]byte{[6]byte{'a', 'b', 'c', 'a', 'b', 'c'}}}, 1177} 1178 1179func TestDeepEqualAllocs(t *testing.T) { 1180 for _, tt := range deepEqualPerfTests { 1181 t.Run(ValueOf(tt.x).Type().String(), func(t *testing.T) { 1182 got := testing.AllocsPerRun(100, func() { 1183 if !DeepEqual(tt.x, tt.y) { 1184 t.Errorf("DeepEqual(%v, %v)=false", tt.x, tt.y) 1185 } 1186 }) 1187 if int(got) != 0 { 1188 t.Errorf("DeepEqual(%v, %v) allocated %d times", tt.x, tt.y, int(got)) 1189 } 1190 }) 1191 } 1192} 1193 1194func BenchmarkDeepEqual(b *testing.B) { 1195 for _, bb := range deepEqualPerfTests { 1196 b.Run(ValueOf(bb.x).Type().String(), func(b *testing.B) { 1197 b.ReportAllocs() 1198 for i := 0; i < b.N; i++ { 1199 sink = DeepEqual(bb.x, bb.y) 1200 } 1201 }) 1202 } 1203} 1204 1205func check2ndField(x any, offs uintptr, t *testing.T) { 1206 s := ValueOf(x) 1207 f := s.Type().Field(1) 1208 if f.Offset != offs { 1209 t.Error("mismatched offsets in structure alignment:", f.Offset, offs) 1210 } 1211} 1212 1213// Check that structure alignment & offsets viewed through reflect agree with those 1214// from the compiler itself. 1215func TestAlignment(t *testing.T) { 1216 type T1inner struct { 1217 a int 1218 } 1219 type T1 struct { 1220 T1inner 1221 f int 1222 } 1223 type T2inner struct { 1224 a, b int 1225 } 1226 type T2 struct { 1227 T2inner 1228 f int 1229 } 1230 1231 x := T1{T1inner{2}, 17} 1232 check2ndField(x, uintptr(unsafe.Pointer(&x.f))-uintptr(unsafe.Pointer(&x)), t) 1233 1234 x1 := T2{T2inner{2, 3}, 17} 1235 check2ndField(x1, uintptr(unsafe.Pointer(&x1.f))-uintptr(unsafe.Pointer(&x1)), t) 1236} 1237 1238func Nil(a any, t *testing.T) { 1239 n := ValueOf(a).Field(0) 1240 if !n.IsNil() { 1241 t.Errorf("%v should be nil", a) 1242 } 1243} 1244 1245func NotNil(a any, t *testing.T) { 1246 n := ValueOf(a).Field(0) 1247 if n.IsNil() { 1248 t.Errorf("value of type %v should not be nil", ValueOf(a).Type().String()) 1249 } 1250} 1251 1252func TestIsNil(t *testing.T) { 1253 // These implement IsNil. 1254 // Wrap in extra struct to hide interface type. 1255 doNil := []any{ 1256 struct{ x *int }{}, 1257 struct{ x any }{}, 1258 struct{ x map[string]int }{}, 1259 struct{ x func() bool }{}, 1260 struct{ x chan int }{}, 1261 struct{ x []string }{}, 1262 struct{ x unsafe.Pointer }{}, 1263 } 1264 for _, ts := range doNil { 1265 ty := TypeOf(ts).Field(0).Type 1266 v := Zero(ty) 1267 v.IsNil() // panics if not okay to call 1268 } 1269 1270 // Check the implementations 1271 var pi struct { 1272 x *int 1273 } 1274 Nil(pi, t) 1275 pi.x = new(int) 1276 NotNil(pi, t) 1277 1278 var si struct { 1279 x []int 1280 } 1281 Nil(si, t) 1282 si.x = make([]int, 10) 1283 NotNil(si, t) 1284 1285 var ci struct { 1286 x chan int 1287 } 1288 Nil(ci, t) 1289 ci.x = make(chan int) 1290 NotNil(ci, t) 1291 1292 var mi struct { 1293 x map[int]int 1294 } 1295 Nil(mi, t) 1296 mi.x = make(map[int]int) 1297 NotNil(mi, t) 1298 1299 var ii struct { 1300 x any 1301 } 1302 Nil(ii, t) 1303 ii.x = 2 1304 NotNil(ii, t) 1305 1306 var fi struct { 1307 x func(t *testing.T) 1308 } 1309 Nil(fi, t) 1310 fi.x = TestIsNil 1311 NotNil(fi, t) 1312} 1313 1314func TestIsZero(t *testing.T) { 1315 for i, tt := range []struct { 1316 x any 1317 want bool 1318 }{ 1319 // Booleans 1320 {true, false}, 1321 {false, true}, 1322 // Numeric types 1323 {int(0), true}, 1324 {int(1), false}, 1325 {int8(0), true}, 1326 {int8(1), false}, 1327 {int16(0), true}, 1328 {int16(1), false}, 1329 {int32(0), true}, 1330 {int32(1), false}, 1331 {int64(0), true}, 1332 {int64(1), false}, 1333 {uint(0), true}, 1334 {uint(1), false}, 1335 {uint8(0), true}, 1336 {uint8(1), false}, 1337 {uint16(0), true}, 1338 {uint16(1), false}, 1339 {uint32(0), true}, 1340 {uint32(1), false}, 1341 {uint64(0), true}, 1342 {uint64(1), false}, 1343 {float32(0), true}, 1344 {float32(1.2), false}, 1345 {float64(0), true}, 1346 {float64(1.2), false}, 1347 {math.Copysign(0, -1), false}, 1348 {complex64(0), true}, 1349 {complex64(1.2), false}, 1350 {complex128(0), true}, 1351 {complex128(1.2), false}, 1352 {complex(math.Copysign(0, -1), 0), false}, 1353 {complex(0, math.Copysign(0, -1)), false}, 1354 {complex(math.Copysign(0, -1), math.Copysign(0, -1)), false}, 1355 {uintptr(0), true}, 1356 {uintptr(128), false}, 1357 // Array 1358 {Zero(TypeOf([5]string{})).Interface(), true}, 1359 {[5]string{"", "", "", "", ""}, true}, 1360 {[5]string{}, true}, 1361 {[5]string{"", "", "", "a", ""}, false}, 1362 // Chan 1363 {(chan string)(nil), true}, 1364 {make(chan string), false}, 1365 {time.After(1), false}, 1366 // Func 1367 {(func())(nil), true}, 1368 {New, false}, 1369 // Interface 1370 {New(TypeOf(new(error)).Elem()).Elem(), true}, 1371 {(io.Reader)(strings.NewReader("")), false}, 1372 // Map 1373 {(map[string]string)(nil), true}, 1374 {map[string]string{}, false}, 1375 {make(map[string]string), false}, 1376 // Pointer 1377 {(*func())(nil), true}, 1378 {(*int)(nil), true}, 1379 {new(int), false}, 1380 // Slice 1381 {[]string{}, false}, 1382 {([]string)(nil), true}, 1383 {make([]string, 0), false}, 1384 // Strings 1385 {"", true}, 1386 {"not-zero", false}, 1387 // Structs 1388 {T{}, true}, 1389 {T{123, 456.75, "hello", &_i}, false}, 1390 // UnsafePointer 1391 {(unsafe.Pointer)(nil), true}, 1392 {(unsafe.Pointer)(new(int)), false}, 1393 } { 1394 var x Value 1395 if v, ok := tt.x.(Value); ok { 1396 x = v 1397 } else { 1398 x = ValueOf(tt.x) 1399 } 1400 1401 b := x.IsZero() 1402 if b != tt.want { 1403 t.Errorf("%d: IsZero((%s)(%+v)) = %t, want %t", i, x.Kind(), tt.x, b, tt.want) 1404 } 1405 1406 if !Zero(TypeOf(tt.x)).IsZero() { 1407 t.Errorf("%d: IsZero(Zero(TypeOf((%s)(%+v)))) is false", i, x.Kind(), tt.x) 1408 } 1409 } 1410 1411 func() { 1412 defer func() { 1413 if r := recover(); r == nil { 1414 t.Error("should panic for invalid value") 1415 } 1416 }() 1417 (Value{}).IsZero() 1418 }() 1419} 1420 1421func TestInterfaceExtraction(t *testing.T) { 1422 var s struct { 1423 W io.Writer 1424 } 1425 1426 s.W = os.Stdout 1427 v := Indirect(ValueOf(&s)).Field(0).Interface() 1428 if v != s.W.(any) { 1429 t.Error("Interface() on interface: ", v, s.W) 1430 } 1431} 1432 1433func TestNilPtrValueSub(t *testing.T) { 1434 var pi *int 1435 if pv := ValueOf(pi); pv.Elem().IsValid() { 1436 t.Error("ValueOf((*int)(nil)).Elem().IsValid()") 1437 } 1438} 1439 1440func TestMap(t *testing.T) { 1441 m := map[string]int{"a": 1, "b": 2} 1442 mv := ValueOf(m) 1443 if n := mv.Len(); n != len(m) { 1444 t.Errorf("Len = %d, want %d", n, len(m)) 1445 } 1446 keys := mv.MapKeys() 1447 newmap := MakeMap(mv.Type()) 1448 for k, v := range m { 1449 // Check that returned Keys match keys in range. 1450 // These aren't required to be in the same order. 1451 seen := false 1452 for _, kv := range keys { 1453 if kv.String() == k { 1454 seen = true 1455 break 1456 } 1457 } 1458 if !seen { 1459 t.Errorf("Missing key %q", k) 1460 } 1461 1462 // Check that value lookup is correct. 1463 vv := mv.MapIndex(ValueOf(k)) 1464 if vi := vv.Int(); vi != int64(v) { 1465 t.Errorf("Key %q: have value %d, want %d", k, vi, v) 1466 } 1467 1468 // Copy into new map. 1469 newmap.SetMapIndex(ValueOf(k), ValueOf(v)) 1470 } 1471 vv := mv.MapIndex(ValueOf("not-present")) 1472 if vv.IsValid() { 1473 t.Errorf("Invalid key: got non-nil value %s", valueToString(vv)) 1474 } 1475 1476 newm := newmap.Interface().(map[string]int) 1477 if len(newm) != len(m) { 1478 t.Errorf("length after copy: newm=%d, m=%d", len(newm), len(m)) 1479 } 1480 1481 for k, v := range newm { 1482 mv, ok := m[k] 1483 if mv != v { 1484 t.Errorf("newm[%q] = %d, but m[%q] = %d, %v", k, v, k, mv, ok) 1485 } 1486 } 1487 1488 newmap.SetMapIndex(ValueOf("a"), Value{}) 1489 v, ok := newm["a"] 1490 if ok { 1491 t.Errorf("newm[\"a\"] = %d after delete", v) 1492 } 1493 1494 mv = ValueOf(&m).Elem() 1495 mv.Set(Zero(mv.Type())) 1496 if m != nil { 1497 t.Errorf("mv.Set(nil) failed") 1498 } 1499} 1500 1501func TestNilMap(t *testing.T) { 1502 var m map[string]int 1503 mv := ValueOf(m) 1504 keys := mv.MapKeys() 1505 if len(keys) != 0 { 1506 t.Errorf(">0 keys for nil map: %v", keys) 1507 } 1508 1509 // Check that value for missing key is zero. 1510 x := mv.MapIndex(ValueOf("hello")) 1511 if x.Kind() != Invalid { 1512 t.Errorf("m.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x) 1513 } 1514 1515 // Check big value too. 1516 var mbig map[string][10 << 20]byte 1517 x = ValueOf(mbig).MapIndex(ValueOf("hello")) 1518 if x.Kind() != Invalid { 1519 t.Errorf("mbig.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x) 1520 } 1521 1522 // Test that deletes from a nil map succeed. 1523 mv.SetMapIndex(ValueOf("hi"), Value{}) 1524} 1525 1526func TestChan(t *testing.T) { 1527 for loop := 0; loop < 2; loop++ { 1528 var c chan int 1529 var cv Value 1530 1531 // check both ways to allocate channels 1532 switch loop { 1533 case 1: 1534 c = make(chan int, 1) 1535 cv = ValueOf(c) 1536 case 0: 1537 cv = MakeChan(TypeOf(c), 1) 1538 c = cv.Interface().(chan int) 1539 } 1540 1541 // Send 1542 cv.Send(ValueOf(2)) 1543 if i := <-c; i != 2 { 1544 t.Errorf("reflect Send 2, native recv %d", i) 1545 } 1546 1547 // Recv 1548 c <- 3 1549 if i, ok := cv.Recv(); i.Int() != 3 || !ok { 1550 t.Errorf("native send 3, reflect Recv %d, %t", i.Int(), ok) 1551 } 1552 1553 // TryRecv fail 1554 val, ok := cv.TryRecv() 1555 if val.IsValid() || ok { 1556 t.Errorf("TryRecv on empty chan: %s, %t", valueToString(val), ok) 1557 } 1558 1559 // TryRecv success 1560 c <- 4 1561 val, ok = cv.TryRecv() 1562 if !val.IsValid() { 1563 t.Errorf("TryRecv on ready chan got nil") 1564 } else if i := val.Int(); i != 4 || !ok { 1565 t.Errorf("native send 4, TryRecv %d, %t", i, ok) 1566 } 1567 1568 // TrySend fail 1569 c <- 100 1570 ok = cv.TrySend(ValueOf(5)) 1571 i := <-c 1572 if ok { 1573 t.Errorf("TrySend on full chan succeeded: value %d", i) 1574 } 1575 1576 // TrySend success 1577 ok = cv.TrySend(ValueOf(6)) 1578 if !ok { 1579 t.Errorf("TrySend on empty chan failed") 1580 select { 1581 case x := <-c: 1582 t.Errorf("TrySend failed but it did send %d", x) 1583 default: 1584 } 1585 } else { 1586 if i = <-c; i != 6 { 1587 t.Errorf("TrySend 6, recv %d", i) 1588 } 1589 } 1590 1591 // Close 1592 c <- 123 1593 cv.Close() 1594 if i, ok := cv.Recv(); i.Int() != 123 || !ok { 1595 t.Errorf("send 123 then close; Recv %d, %t", i.Int(), ok) 1596 } 1597 if i, ok := cv.Recv(); i.Int() != 0 || ok { 1598 t.Errorf("after close Recv %d, %t", i.Int(), ok) 1599 } 1600 } 1601 1602 // check creation of unbuffered channel 1603 var c chan int 1604 cv := MakeChan(TypeOf(c), 0) 1605 c = cv.Interface().(chan int) 1606 if cv.TrySend(ValueOf(7)) { 1607 t.Errorf("TrySend on sync chan succeeded") 1608 } 1609 if v, ok := cv.TryRecv(); v.IsValid() || ok { 1610 t.Errorf("TryRecv on sync chan succeeded: isvalid=%v ok=%v", v.IsValid(), ok) 1611 } 1612 1613 // len/cap 1614 cv = MakeChan(TypeOf(c), 10) 1615 c = cv.Interface().(chan int) 1616 for i := 0; i < 3; i++ { 1617 c <- i 1618 } 1619 if l, m := cv.Len(), cv.Cap(); l != len(c) || m != cap(c) { 1620 t.Errorf("Len/Cap = %d/%d want %d/%d", l, m, len(c), cap(c)) 1621 } 1622} 1623 1624// caseInfo describes a single case in a select test. 1625type caseInfo struct { 1626 desc string 1627 canSelect bool 1628 recv Value 1629 closed bool 1630 helper func() 1631 panic bool 1632} 1633 1634var allselect = flag.Bool("allselect", false, "exhaustive select test") 1635 1636func TestSelect(t *testing.T) { 1637 selectWatch.once.Do(func() { go selectWatcher() }) 1638 1639 var x exhaustive 1640 nch := 0 1641 newop := func(n int, cap int) (ch, val Value) { 1642 nch++ 1643 if nch%101%2 == 1 { 1644 c := make(chan int, cap) 1645 ch = ValueOf(c) 1646 val = ValueOf(n) 1647 } else { 1648 c := make(chan string, cap) 1649 ch = ValueOf(c) 1650 val = ValueOf(fmt.Sprint(n)) 1651 } 1652 return 1653 } 1654 1655 for n := 0; x.Next(); n++ { 1656 if testing.Short() && n >= 1000 { 1657 break 1658 } 1659 if n >= 100000 && !*allselect { 1660 break 1661 } 1662 if n%100000 == 0 && testing.Verbose() { 1663 println("TestSelect", n) 1664 } 1665 var cases []SelectCase 1666 var info []caseInfo 1667 1668 // Ready send. 1669 if x.Maybe() { 1670 ch, val := newop(len(cases), 1) 1671 cases = append(cases, SelectCase{ 1672 Dir: SelectSend, 1673 Chan: ch, 1674 Send: val, 1675 }) 1676 info = append(info, caseInfo{desc: "ready send", canSelect: true}) 1677 } 1678 1679 // Ready recv. 1680 if x.Maybe() { 1681 ch, val := newop(len(cases), 1) 1682 ch.Send(val) 1683 cases = append(cases, SelectCase{ 1684 Dir: SelectRecv, 1685 Chan: ch, 1686 }) 1687 info = append(info, caseInfo{desc: "ready recv", canSelect: true, recv: val}) 1688 } 1689 1690 // Blocking send. 1691 if x.Maybe() { 1692 ch, val := newop(len(cases), 0) 1693 cases = append(cases, SelectCase{ 1694 Dir: SelectSend, 1695 Chan: ch, 1696 Send: val, 1697 }) 1698 // Let it execute? 1699 if x.Maybe() { 1700 f := func() { ch.Recv() } 1701 info = append(info, caseInfo{desc: "blocking send", helper: f}) 1702 } else { 1703 info = append(info, caseInfo{desc: "blocking send"}) 1704 } 1705 } 1706 1707 // Blocking recv. 1708 if x.Maybe() { 1709 ch, val := newop(len(cases), 0) 1710 cases = append(cases, SelectCase{ 1711 Dir: SelectRecv, 1712 Chan: ch, 1713 }) 1714 // Let it execute? 1715 if x.Maybe() { 1716 f := func() { ch.Send(val) } 1717 info = append(info, caseInfo{desc: "blocking recv", recv: val, helper: f}) 1718 } else { 1719 info = append(info, caseInfo{desc: "blocking recv"}) 1720 } 1721 } 1722 1723 // Zero Chan send. 1724 if x.Maybe() { 1725 // Maybe include value to send. 1726 var val Value 1727 if x.Maybe() { 1728 val = ValueOf(100) 1729 } 1730 cases = append(cases, SelectCase{ 1731 Dir: SelectSend, 1732 Send: val, 1733 }) 1734 info = append(info, caseInfo{desc: "zero Chan send"}) 1735 } 1736 1737 // Zero Chan receive. 1738 if x.Maybe() { 1739 cases = append(cases, SelectCase{ 1740 Dir: SelectRecv, 1741 }) 1742 info = append(info, caseInfo{desc: "zero Chan recv"}) 1743 } 1744 1745 // nil Chan send. 1746 if x.Maybe() { 1747 cases = append(cases, SelectCase{ 1748 Dir: SelectSend, 1749 Chan: ValueOf((chan int)(nil)), 1750 Send: ValueOf(101), 1751 }) 1752 info = append(info, caseInfo{desc: "nil Chan send"}) 1753 } 1754 1755 // nil Chan recv. 1756 if x.Maybe() { 1757 cases = append(cases, SelectCase{ 1758 Dir: SelectRecv, 1759 Chan: ValueOf((chan int)(nil)), 1760 }) 1761 info = append(info, caseInfo{desc: "nil Chan recv"}) 1762 } 1763 1764 // closed Chan send. 1765 if x.Maybe() { 1766 ch := make(chan int) 1767 close(ch) 1768 cases = append(cases, SelectCase{ 1769 Dir: SelectSend, 1770 Chan: ValueOf(ch), 1771 Send: ValueOf(101), 1772 }) 1773 info = append(info, caseInfo{desc: "closed Chan send", canSelect: true, panic: true}) 1774 } 1775 1776 // closed Chan recv. 1777 if x.Maybe() { 1778 ch, val := newop(len(cases), 0) 1779 ch.Close() 1780 val = Zero(val.Type()) 1781 cases = append(cases, SelectCase{ 1782 Dir: SelectRecv, 1783 Chan: ch, 1784 }) 1785 info = append(info, caseInfo{desc: "closed Chan recv", canSelect: true, closed: true, recv: val}) 1786 } 1787 1788 var helper func() // goroutine to help the select complete 1789 1790 // Add default? Must be last case here, but will permute. 1791 // Add the default if the select would otherwise 1792 // block forever, and maybe add it anyway. 1793 numCanSelect := 0 1794 canProceed := false 1795 canBlock := true 1796 canPanic := false 1797 helpers := []int{} 1798 for i, c := range info { 1799 if c.canSelect { 1800 canProceed = true 1801 canBlock = false 1802 numCanSelect++ 1803 if c.panic { 1804 canPanic = true 1805 } 1806 } else if c.helper != nil { 1807 canProceed = true 1808 helpers = append(helpers, i) 1809 } 1810 } 1811 if !canProceed || x.Maybe() { 1812 cases = append(cases, SelectCase{ 1813 Dir: SelectDefault, 1814 }) 1815 info = append(info, caseInfo{desc: "default", canSelect: canBlock}) 1816 numCanSelect++ 1817 } else if canBlock { 1818 // Select needs to communicate with another goroutine. 1819 cas := &info[helpers[x.Choose(len(helpers))]] 1820 helper = cas.helper 1821 cas.canSelect = true 1822 numCanSelect++ 1823 } 1824 1825 // Permute cases and case info. 1826 // Doing too much here makes the exhaustive loop 1827 // too exhausting, so just do two swaps. 1828 for loop := 0; loop < 2; loop++ { 1829 i := x.Choose(len(cases)) 1830 j := x.Choose(len(cases)) 1831 cases[i], cases[j] = cases[j], cases[i] 1832 info[i], info[j] = info[j], info[i] 1833 } 1834 1835 if helper != nil { 1836 // We wait before kicking off a goroutine to satisfy a blocked select. 1837 // The pause needs to be big enough to let the select block before 1838 // we run the helper, but if we lose that race once in a while it's okay: the 1839 // select will just proceed immediately. Not a big deal. 1840 // For short tests we can grow [sic] the timeout a bit without fear of taking too long 1841 pause := 10 * time.Microsecond 1842 if testing.Short() { 1843 pause = 100 * time.Microsecond 1844 } 1845 time.AfterFunc(pause, helper) 1846 } 1847 1848 // Run select. 1849 i, recv, recvOK, panicErr := runSelect(cases, info) 1850 if panicErr != nil && !canPanic { 1851 t.Fatalf("%s\npanicked unexpectedly: %v", fmtSelect(info), panicErr) 1852 } 1853 if panicErr == nil && canPanic && numCanSelect == 1 { 1854 t.Fatalf("%s\nselected #%d incorrectly (should panic)", fmtSelect(info), i) 1855 } 1856 if panicErr != nil { 1857 continue 1858 } 1859 1860 cas := info[i] 1861 if !cas.canSelect { 1862 recvStr := "" 1863 if recv.IsValid() { 1864 recvStr = fmt.Sprintf(", received %v, %v", recv.Interface(), recvOK) 1865 } 1866 t.Fatalf("%s\nselected #%d incorrectly%s", fmtSelect(info), i, recvStr) 1867 continue 1868 } 1869 if cas.panic { 1870 t.Fatalf("%s\nselected #%d incorrectly (case should panic)", fmtSelect(info), i) 1871 continue 1872 } 1873 1874 if cases[i].Dir == SelectRecv { 1875 if !recv.IsValid() { 1876 t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, cas.recv.Interface(), !cas.closed) 1877 } 1878 if !cas.recv.IsValid() { 1879 t.Fatalf("%s\nselected #%d but internal error: missing recv value", fmtSelect(info), i) 1880 } 1881 if recv.Interface() != cas.recv.Interface() || recvOK != !cas.closed { 1882 if recv.Interface() == cas.recv.Interface() && recvOK == !cas.closed { 1883 t.Fatalf("%s\nselected #%d, got %#v, %v, and DeepEqual is broken on %T", fmtSelect(info), i, recv.Interface(), recvOK, recv.Interface()) 1884 } 1885 t.Fatalf("%s\nselected #%d but got %#v, %v, want %#v, %v", fmtSelect(info), i, recv.Interface(), recvOK, cas.recv.Interface(), !cas.closed) 1886 } 1887 } else { 1888 if recv.IsValid() || recvOK { 1889 t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, Value{}, false) 1890 } 1891 } 1892 } 1893} 1894 1895func TestSelectMaxCases(t *testing.T) { 1896 var sCases []SelectCase 1897 channel := make(chan int) 1898 close(channel) 1899 for i := 0; i < 65536; i++ { 1900 sCases = append(sCases, SelectCase{ 1901 Dir: SelectRecv, 1902 Chan: ValueOf(channel), 1903 }) 1904 } 1905 // Should not panic 1906 _, _, _ = Select(sCases) 1907 sCases = append(sCases, SelectCase{ 1908 Dir: SelectRecv, 1909 Chan: ValueOf(channel), 1910 }) 1911 defer func() { 1912 if err := recover(); err != nil { 1913 if err.(string) != "reflect.Select: too many cases (max 65536)" { 1914 t.Fatalf("unexpected error from select call with greater than max supported cases") 1915 } 1916 } else { 1917 t.Fatalf("expected select call to panic with greater than max supported cases") 1918 } 1919 }() 1920 // Should panic 1921 _, _, _ = Select(sCases) 1922} 1923 1924func TestSelectNop(t *testing.T) { 1925 // "select { default: }" should always return the default case. 1926 chosen, _, _ := Select([]SelectCase{{Dir: SelectDefault}}) 1927 if chosen != 0 { 1928 t.Fatalf("expected Select to return 0, but got %#v", chosen) 1929 } 1930} 1931 1932func BenchmarkSelect(b *testing.B) { 1933 channel := make(chan int) 1934 close(channel) 1935 var cases []SelectCase 1936 for i := 0; i < 8; i++ { 1937 cases = append(cases, SelectCase{ 1938 Dir: SelectRecv, 1939 Chan: ValueOf(channel), 1940 }) 1941 } 1942 for _, numCases := range []int{1, 4, 8} { 1943 b.Run(strconv.Itoa(numCases), func(b *testing.B) { 1944 b.ReportAllocs() 1945 for i := 0; i < b.N; i++ { 1946 _, _, _ = Select(cases[:numCases]) 1947 } 1948 }) 1949 } 1950} 1951 1952// selectWatch and the selectWatcher are a watchdog mechanism for running Select. 1953// If the selectWatcher notices that the select has been blocked for >1 second, it prints 1954// an error describing the select and panics the entire test binary. 1955var selectWatch struct { 1956 sync.Mutex 1957 once sync.Once 1958 now time.Time 1959 info []caseInfo 1960} 1961 1962func selectWatcher() { 1963 for { 1964 time.Sleep(1 * time.Second) 1965 selectWatch.Lock() 1966 if selectWatch.info != nil && time.Since(selectWatch.now) > 10*time.Second { 1967 fmt.Fprintf(os.Stderr, "TestSelect:\n%s blocked indefinitely\n", fmtSelect(selectWatch.info)) 1968 panic("select stuck") 1969 } 1970 selectWatch.Unlock() 1971 } 1972} 1973 1974// runSelect runs a single select test. 1975// It returns the values returned by Select but also returns 1976// a panic value if the Select panics. 1977func runSelect(cases []SelectCase, info []caseInfo) (chosen int, recv Value, recvOK bool, panicErr any) { 1978 defer func() { 1979 panicErr = recover() 1980 1981 selectWatch.Lock() 1982 selectWatch.info = nil 1983 selectWatch.Unlock() 1984 }() 1985 1986 selectWatch.Lock() 1987 selectWatch.now = time.Now() 1988 selectWatch.info = info 1989 selectWatch.Unlock() 1990 1991 chosen, recv, recvOK = Select(cases) 1992 return 1993} 1994 1995// fmtSelect formats the information about a single select test. 1996func fmtSelect(info []caseInfo) string { 1997 var buf bytes.Buffer 1998 fmt.Fprintf(&buf, "\nselect {\n") 1999 for i, cas := range info { 2000 fmt.Fprintf(&buf, "%d: %s", i, cas.desc) 2001 if cas.recv.IsValid() { 2002 fmt.Fprintf(&buf, " val=%#v", cas.recv.Interface()) 2003 } 2004 if cas.canSelect { 2005 fmt.Fprintf(&buf, " canselect") 2006 } 2007 if cas.panic { 2008 fmt.Fprintf(&buf, " panic") 2009 } 2010 fmt.Fprintf(&buf, "\n") 2011 } 2012 fmt.Fprintf(&buf, "}") 2013 return buf.String() 2014} 2015 2016type two [2]uintptr 2017 2018// Difficult test for function call because of 2019// implicit padding between arguments. 2020func 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) { 2021 return b, c, d, e, f, g, h 2022} 2023 2024func TestFunc(t *testing.T) { 2025 ret := ValueOf(dummy).Call([]Value{ 2026 ValueOf(byte(10)), 2027 ValueOf(20), 2028 ValueOf(byte(30)), 2029 ValueOf(two{40, 50}), 2030 ValueOf(byte(60)), 2031 ValueOf(float32(70)), 2032 ValueOf(byte(80)), 2033 }) 2034 if len(ret) != 7 { 2035 t.Fatalf("Call returned %d values, want 7", len(ret)) 2036 } 2037 2038 i := byte(ret[0].Uint()) 2039 j := int(ret[1].Int()) 2040 k := byte(ret[2].Uint()) 2041 l := ret[3].Interface().(two) 2042 m := byte(ret[4].Uint()) 2043 n := float32(ret[5].Float()) 2044 o := byte(ret[6].Uint()) 2045 2046 if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 { 2047 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) 2048 } 2049 2050 for i, v := range ret { 2051 if v.CanAddr() { 2052 t.Errorf("result %d is addressable", i) 2053 } 2054 } 2055} 2056 2057func TestCallConvert(t *testing.T) { 2058 v := ValueOf(new(io.ReadWriter)).Elem() 2059 f := ValueOf(func(r io.Reader) io.Reader { return r }) 2060 out := f.Call([]Value{v}) 2061 if len(out) != 1 || out[0].Type() != TypeOf(new(io.Reader)).Elem() || !out[0].IsNil() { 2062 t.Errorf("expected [nil], got %v", out) 2063 } 2064} 2065 2066type emptyStruct struct{} 2067 2068type nonEmptyStruct struct { 2069 member int 2070} 2071 2072func returnEmpty() emptyStruct { 2073 return emptyStruct{} 2074} 2075 2076func takesEmpty(e emptyStruct) { 2077} 2078 2079func returnNonEmpty(i int) nonEmptyStruct { 2080 return nonEmptyStruct{member: i} 2081} 2082 2083func takesNonEmpty(n nonEmptyStruct) int { 2084 return n.member 2085} 2086 2087func TestCallWithStruct(t *testing.T) { 2088 r := ValueOf(returnEmpty).Call(nil) 2089 if len(r) != 1 || r[0].Type() != TypeOf(emptyStruct{}) { 2090 t.Errorf("returning empty struct returned %#v instead", r) 2091 } 2092 r = ValueOf(takesEmpty).Call([]Value{ValueOf(emptyStruct{})}) 2093 if len(r) != 0 { 2094 t.Errorf("takesEmpty returned values: %#v", r) 2095 } 2096 r = ValueOf(returnNonEmpty).Call([]Value{ValueOf(42)}) 2097 if len(r) != 1 || r[0].Type() != TypeOf(nonEmptyStruct{}) || r[0].Field(0).Int() != 42 { 2098 t.Errorf("returnNonEmpty returned %#v", r) 2099 } 2100 r = ValueOf(takesNonEmpty).Call([]Value{ValueOf(nonEmptyStruct{member: 42})}) 2101 if len(r) != 1 || r[0].Type() != TypeOf(1) || r[0].Int() != 42 { 2102 t.Errorf("takesNonEmpty returned %#v", r) 2103 } 2104} 2105 2106func TestCallReturnsEmpty(t *testing.T) { 2107 // Issue 21717: past-the-end pointer write in Call with 2108 // nonzero-sized frame and zero-sized return value. 2109 runtime.GC() 2110 var finalized uint32 2111 f := func() (emptyStruct, *[2]int64) { 2112 i := new([2]int64) // big enough to not be tinyalloc'd, so finalizer always runs when i dies 2113 runtime.SetFinalizer(i, func(*[2]int64) { atomic.StoreUint32(&finalized, 1) }) 2114 return emptyStruct{}, i 2115 } 2116 v := ValueOf(f).Call(nil)[0] // out[0] should not alias out[1]'s memory, so the finalizer should run. 2117 timeout := time.After(5 * time.Second) 2118 for atomic.LoadUint32(&finalized) == 0 { 2119 select { 2120 case <-timeout: 2121 t.Fatal("finalizer did not run") 2122 default: 2123 } 2124 runtime.Gosched() 2125 runtime.GC() 2126 } 2127 runtime.KeepAlive(v) 2128} 2129 2130func BenchmarkCall(b *testing.B) { 2131 fv := ValueOf(func(a, b string) {}) 2132 b.ReportAllocs() 2133 b.RunParallel(func(pb *testing.PB) { 2134 args := []Value{ValueOf("a"), ValueOf("b")} 2135 for pb.Next() { 2136 fv.Call(args) 2137 } 2138 }) 2139} 2140 2141type myint int64 2142 2143func (i *myint) inc() { 2144 *i = *i + 1 2145} 2146 2147func BenchmarkCallMethod(b *testing.B) { 2148 b.ReportAllocs() 2149 z := new(myint) 2150 2151 v := ValueOf(z.inc) 2152 for i := 0; i < b.N; i++ { 2153 v.Call(nil) 2154 } 2155} 2156 2157func BenchmarkCallArgCopy(b *testing.B) { 2158 byteArray := func(n int) Value { 2159 return Zero(ArrayOf(n, TypeOf(byte(0)))) 2160 } 2161 sizes := [...]struct { 2162 fv Value 2163 arg Value 2164 }{ 2165 {ValueOf(func(a [128]byte) {}), byteArray(128)}, 2166 {ValueOf(func(a [256]byte) {}), byteArray(256)}, 2167 {ValueOf(func(a [1024]byte) {}), byteArray(1024)}, 2168 {ValueOf(func(a [4096]byte) {}), byteArray(4096)}, 2169 {ValueOf(func(a [65536]byte) {}), byteArray(65536)}, 2170 } 2171 for _, size := range sizes { 2172 bench := func(b *testing.B) { 2173 args := []Value{size.arg} 2174 b.SetBytes(int64(size.arg.Len())) 2175 b.ResetTimer() 2176 b.RunParallel(func(pb *testing.PB) { 2177 for pb.Next() { 2178 size.fv.Call(args) 2179 } 2180 }) 2181 } 2182 name := fmt.Sprintf("size=%v", size.arg.Len()) 2183 b.Run(name, bench) 2184 } 2185} 2186 2187func TestMakeFunc(t *testing.T) { 2188 f := dummy 2189 fv := MakeFunc(TypeOf(f), func(in []Value) []Value { return in }) 2190 ValueOf(&f).Elem().Set(fv) 2191 2192 // Call g with small arguments so that there is 2193 // something predictable (and different from the 2194 // correct results) in those positions on the stack. 2195 g := dummy 2196 g(1, 2, 3, two{4, 5}, 6, 7, 8) 2197 2198 // Call constructed function f. 2199 i, j, k, l, m, n, o := f(10, 20, 30, two{40, 50}, 60, 70, 80) 2200 if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 { 2201 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) 2202 } 2203} 2204 2205func TestMakeFuncInterface(t *testing.T) { 2206 fn := func(i int) int { return i } 2207 incr := func(in []Value) []Value { 2208 return []Value{ValueOf(int(in[0].Int() + 1))} 2209 } 2210 fv := MakeFunc(TypeOf(fn), incr) 2211 ValueOf(&fn).Elem().Set(fv) 2212 if r := fn(2); r != 3 { 2213 t.Errorf("Call returned %d, want 3", r) 2214 } 2215 if r := fv.Call([]Value{ValueOf(14)})[0].Int(); r != 15 { 2216 t.Errorf("Call returned %d, want 15", r) 2217 } 2218 if r := fv.Interface().(func(int) int)(26); r != 27 { 2219 t.Errorf("Call returned %d, want 27", r) 2220 } 2221} 2222 2223func TestMakeFuncVariadic(t *testing.T) { 2224 // Test that variadic arguments are packed into a slice and passed as last arg 2225 fn := func(_ int, is ...int) []int { return nil } 2226 fv := MakeFunc(TypeOf(fn), func(in []Value) []Value { return in[1:2] }) 2227 ValueOf(&fn).Elem().Set(fv) 2228 2229 r := fn(1, 2, 3) 2230 if r[0] != 2 || r[1] != 3 { 2231 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2232 } 2233 2234 r = fn(1, []int{2, 3}...) 2235 if r[0] != 2 || r[1] != 3 { 2236 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2237 } 2238 2239 r = fv.Call([]Value{ValueOf(1), ValueOf(2), ValueOf(3)})[0].Interface().([]int) 2240 if r[0] != 2 || r[1] != 3 { 2241 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2242 } 2243 2244 r = fv.CallSlice([]Value{ValueOf(1), ValueOf([]int{2, 3})})[0].Interface().([]int) 2245 if r[0] != 2 || r[1] != 3 { 2246 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2247 } 2248 2249 f := fv.Interface().(func(int, ...int) []int) 2250 2251 r = f(1, 2, 3) 2252 if r[0] != 2 || r[1] != 3 { 2253 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2254 } 2255 r = f(1, []int{2, 3}...) 2256 if r[0] != 2 || r[1] != 3 { 2257 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) 2258 } 2259} 2260 2261// Dummy type that implements io.WriteCloser 2262type WC struct { 2263} 2264 2265func (w *WC) Write(p []byte) (n int, err error) { 2266 return 0, nil 2267} 2268func (w *WC) Close() error { 2269 return nil 2270} 2271 2272func TestMakeFuncValidReturnAssignments(t *testing.T) { 2273 // reflect.Values returned from the wrapped function should be assignment-converted 2274 // to the types returned by the result of MakeFunc. 2275 2276 // Concrete types should be promotable to interfaces they implement. 2277 var f func() error 2278 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2279 return []Value{ValueOf(io.EOF)} 2280 }).Interface().(func() error) 2281 f() 2282 2283 // Super-interfaces should be promotable to simpler interfaces. 2284 var g func() io.Writer 2285 g = MakeFunc(TypeOf(g), func([]Value) []Value { 2286 var w io.WriteCloser = &WC{} 2287 return []Value{ValueOf(&w).Elem()} 2288 }).Interface().(func() io.Writer) 2289 g() 2290 2291 // Channels should be promotable to directional channels. 2292 var h func() <-chan int 2293 h = MakeFunc(TypeOf(h), func([]Value) []Value { 2294 return []Value{ValueOf(make(chan int))} 2295 }).Interface().(func() <-chan int) 2296 h() 2297 2298 // Unnamed types should be promotable to named types. 2299 type T struct{ a, b, c int } 2300 var i func() T 2301 i = MakeFunc(TypeOf(i), func([]Value) []Value { 2302 return []Value{ValueOf(struct{ a, b, c int }{a: 1, b: 2, c: 3})} 2303 }).Interface().(func() T) 2304 i() 2305} 2306 2307func TestMakeFuncInvalidReturnAssignments(t *testing.T) { 2308 // Type doesn't implement the required interface. 2309 shouldPanic("", func() { 2310 var f func() error 2311 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2312 return []Value{ValueOf(int(7))} 2313 }).Interface().(func() error) 2314 f() 2315 }) 2316 // Assigning to an interface with additional methods. 2317 shouldPanic("", func() { 2318 var f func() io.ReadWriteCloser 2319 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2320 var w io.WriteCloser = &WC{} 2321 return []Value{ValueOf(&w).Elem()} 2322 }).Interface().(func() io.ReadWriteCloser) 2323 f() 2324 }) 2325 // Directional channels can't be assigned to bidirectional ones. 2326 shouldPanic("", func() { 2327 var f func() chan int 2328 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2329 var c <-chan int = make(chan int) 2330 return []Value{ValueOf(c)} 2331 }).Interface().(func() chan int) 2332 f() 2333 }) 2334 // Two named types which are otherwise identical. 2335 shouldPanic("", func() { 2336 type T struct{ a, b, c int } 2337 type U struct{ a, b, c int } 2338 var f func() T 2339 f = MakeFunc(TypeOf(f), func([]Value) []Value { 2340 return []Value{ValueOf(U{a: 1, b: 2, c: 3})} 2341 }).Interface().(func() T) 2342 f() 2343 }) 2344} 2345 2346type Point struct { 2347 x, y int 2348} 2349 2350// This will be index 0. 2351func (p Point) AnotherMethod(scale int) int { 2352 return -1 2353} 2354 2355// This will be index 1. 2356func (p Point) Dist(scale int) int { 2357 //println("Point.Dist", p.x, p.y, scale) 2358 return p.x*p.x*scale + p.y*p.y*scale 2359} 2360 2361// This will be index 2. 2362func (p Point) GCMethod(k int) int { 2363 runtime.GC() 2364 return k + p.x 2365} 2366 2367// This will be index 3. 2368func (p Point) NoArgs() { 2369 // Exercise no-argument/no-result paths. 2370} 2371 2372// This will be index 4. 2373func (p Point) TotalDist(points ...Point) int { 2374 tot := 0 2375 for _, q := range points { 2376 dx := q.x - p.x 2377 dy := q.y - p.y 2378 tot += dx*dx + dy*dy // Should call Sqrt, but it's just a test. 2379 2380 } 2381 return tot 2382} 2383 2384// This will be index 5. 2385func (p *Point) Int64Method(x int64) int64 { 2386 return x 2387} 2388 2389// This will be index 6. 2390func (p *Point) Int32Method(x int32) int32 { 2391 return x 2392} 2393 2394func TestMethod(t *testing.T) { 2395 // Non-curried method of type. 2396 p := Point{3, 4} 2397 i := TypeOf(p).Method(1).Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int() 2398 if i != 250 { 2399 t.Errorf("Type Method returned %d; want 250", i) 2400 } 2401 2402 m, ok := TypeOf(p).MethodByName("Dist") 2403 if !ok { 2404 t.Fatalf("method by name failed") 2405 } 2406 i = m.Func.Call([]Value{ValueOf(p), ValueOf(11)})[0].Int() 2407 if i != 275 { 2408 t.Errorf("Type MethodByName returned %d; want 275", i) 2409 } 2410 2411 m, ok = TypeOf(p).MethodByName("NoArgs") 2412 if !ok { 2413 t.Fatalf("method by name failed") 2414 } 2415 n := len(m.Func.Call([]Value{ValueOf(p)})) 2416 if n != 0 { 2417 t.Errorf("NoArgs returned %d values; want 0", n) 2418 } 2419 2420 i = TypeOf(&p).Method(1).Func.Call([]Value{ValueOf(&p), ValueOf(12)})[0].Int() 2421 if i != 300 { 2422 t.Errorf("Pointer Type Method returned %d; want 300", i) 2423 } 2424 2425 m, ok = TypeOf(&p).MethodByName("Dist") 2426 if !ok { 2427 t.Fatalf("ptr method by name failed") 2428 } 2429 i = m.Func.Call([]Value{ValueOf(&p), ValueOf(13)})[0].Int() 2430 if i != 325 { 2431 t.Errorf("Pointer Type MethodByName returned %d; want 325", i) 2432 } 2433 2434 m, ok = TypeOf(&p).MethodByName("NoArgs") 2435 if !ok { 2436 t.Fatalf("method by name failed") 2437 } 2438 n = len(m.Func.Call([]Value{ValueOf(&p)})) 2439 if n != 0 { 2440 t.Errorf("NoArgs returned %d values; want 0", n) 2441 } 2442 2443 // Curried method of value. 2444 tfunc := TypeOf((func(int) int)(nil)) 2445 v := ValueOf(p).Method(1) 2446 if tt := v.Type(); tt != tfunc { 2447 t.Errorf("Value Method Type is %s; want %s", tt, tfunc) 2448 } 2449 i = v.Call([]Value{ValueOf(14)})[0].Int() 2450 if i != 350 { 2451 t.Errorf("Value Method returned %d; want 350", i) 2452 } 2453 v = ValueOf(p).MethodByName("Dist") 2454 if tt := v.Type(); tt != tfunc { 2455 t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc) 2456 } 2457 i = v.Call([]Value{ValueOf(15)})[0].Int() 2458 if i != 375 { 2459 t.Errorf("Value MethodByName returned %d; want 375", i) 2460 } 2461 v = ValueOf(p).MethodByName("NoArgs") 2462 v.Call(nil) 2463 2464 // Curried method of pointer. 2465 v = ValueOf(&p).Method(1) 2466 if tt := v.Type(); tt != tfunc { 2467 t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc) 2468 } 2469 i = v.Call([]Value{ValueOf(16)})[0].Int() 2470 if i != 400 { 2471 t.Errorf("Pointer Value Method returned %d; want 400", i) 2472 } 2473 v = ValueOf(&p).MethodByName("Dist") 2474 if tt := v.Type(); tt != tfunc { 2475 t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc) 2476 } 2477 i = v.Call([]Value{ValueOf(17)})[0].Int() 2478 if i != 425 { 2479 t.Errorf("Pointer Value MethodByName returned %d; want 425", i) 2480 } 2481 v = ValueOf(&p).MethodByName("NoArgs") 2482 v.Call(nil) 2483 2484 // Curried method of interface value. 2485 // Have to wrap interface value in a struct to get at it. 2486 // Passing it to ValueOf directly would 2487 // access the underlying Point, not the interface. 2488 var x interface { 2489 Dist(int) int 2490 } = p 2491 pv := ValueOf(&x).Elem() 2492 v = pv.Method(0) 2493 if tt := v.Type(); tt != tfunc { 2494 t.Errorf("Interface Method Type is %s; want %s", tt, tfunc) 2495 } 2496 i = v.Call([]Value{ValueOf(18)})[0].Int() 2497 if i != 450 { 2498 t.Errorf("Interface Method returned %d; want 450", i) 2499 } 2500 v = pv.MethodByName("Dist") 2501 if tt := v.Type(); tt != tfunc { 2502 t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc) 2503 } 2504 i = v.Call([]Value{ValueOf(19)})[0].Int() 2505 if i != 475 { 2506 t.Errorf("Interface MethodByName returned %d; want 475", i) 2507 } 2508} 2509 2510func TestMethodValue(t *testing.T) { 2511 p := Point{3, 4} 2512 var i int64 2513 2514 // Check that method value have the same underlying code pointers. 2515 if p1, p2 := ValueOf(Point{1, 1}).Method(1), ValueOf(Point{2, 2}).Method(1); p1.Pointer() != p2.Pointer() { 2516 t.Errorf("methodValueCall mismatched: %v - %v", p1, p2) 2517 } 2518 2519 // Curried method of value. 2520 tfunc := TypeOf((func(int) int)(nil)) 2521 v := ValueOf(p).Method(1) 2522 if tt := v.Type(); tt != tfunc { 2523 t.Errorf("Value Method Type is %s; want %s", tt, tfunc) 2524 } 2525 i = ValueOf(v.Interface()).Call([]Value{ValueOf(10)})[0].Int() 2526 if i != 250 { 2527 t.Errorf("Value Method returned %d; want 250", i) 2528 } 2529 v = ValueOf(p).MethodByName("Dist") 2530 if tt := v.Type(); tt != tfunc { 2531 t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc) 2532 } 2533 i = ValueOf(v.Interface()).Call([]Value{ValueOf(11)})[0].Int() 2534 if i != 275 { 2535 t.Errorf("Value MethodByName returned %d; want 275", i) 2536 } 2537 v = ValueOf(p).MethodByName("NoArgs") 2538 ValueOf(v.Interface()).Call(nil) 2539 v.Interface().(func())() 2540 2541 // Curried method of pointer. 2542 v = ValueOf(&p).Method(1) 2543 if tt := v.Type(); tt != tfunc { 2544 t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc) 2545 } 2546 i = ValueOf(v.Interface()).Call([]Value{ValueOf(12)})[0].Int() 2547 if i != 300 { 2548 t.Errorf("Pointer Value Method returned %d; want 300", i) 2549 } 2550 v = ValueOf(&p).MethodByName("Dist") 2551 if tt := v.Type(); tt != tfunc { 2552 t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc) 2553 } 2554 i = ValueOf(v.Interface()).Call([]Value{ValueOf(13)})[0].Int() 2555 if i != 325 { 2556 t.Errorf("Pointer Value MethodByName returned %d; want 325", i) 2557 } 2558 v = ValueOf(&p).MethodByName("NoArgs") 2559 ValueOf(v.Interface()).Call(nil) 2560 v.Interface().(func())() 2561 2562 // Curried method of pointer to pointer. 2563 pp := &p 2564 v = ValueOf(&pp).Elem().Method(1) 2565 if tt := v.Type(); tt != tfunc { 2566 t.Errorf("Pointer Pointer Value Method Type is %s; want %s", tt, tfunc) 2567 } 2568 i = ValueOf(v.Interface()).Call([]Value{ValueOf(14)})[0].Int() 2569 if i != 350 { 2570 t.Errorf("Pointer Pointer Value Method returned %d; want 350", i) 2571 } 2572 v = ValueOf(&pp).Elem().MethodByName("Dist") 2573 if tt := v.Type(); tt != tfunc { 2574 t.Errorf("Pointer Pointer Value MethodByName Type is %s; want %s", tt, tfunc) 2575 } 2576 i = ValueOf(v.Interface()).Call([]Value{ValueOf(15)})[0].Int() 2577 if i != 375 { 2578 t.Errorf("Pointer Pointer Value MethodByName returned %d; want 375", i) 2579 } 2580 2581 // Curried method of interface value. 2582 // Have to wrap interface value in a struct to get at it. 2583 // Passing it to ValueOf directly would 2584 // access the underlying Point, not the interface. 2585 var s = struct { 2586 X interface { 2587 Dist(int) int 2588 } 2589 }{p} 2590 pv := ValueOf(s).Field(0) 2591 v = pv.Method(0) 2592 if tt := v.Type(); tt != tfunc { 2593 t.Errorf("Interface Method Type is %s; want %s", tt, tfunc) 2594 } 2595 i = ValueOf(v.Interface()).Call([]Value{ValueOf(16)})[0].Int() 2596 if i != 400 { 2597 t.Errorf("Interface Method returned %d; want 400", i) 2598 } 2599 v = pv.MethodByName("Dist") 2600 if tt := v.Type(); tt != tfunc { 2601 t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc) 2602 } 2603 i = ValueOf(v.Interface()).Call([]Value{ValueOf(17)})[0].Int() 2604 if i != 425 { 2605 t.Errorf("Interface MethodByName returned %d; want 425", i) 2606 } 2607 2608 // For issue #33628: method args are not stored at the right offset 2609 // on amd64p32. 2610 m64 := ValueOf(&p).MethodByName("Int64Method").Interface().(func(int64) int64) 2611 if x := m64(123); x != 123 { 2612 t.Errorf("Int64Method returned %d; want 123", x) 2613 } 2614 m32 := ValueOf(&p).MethodByName("Int32Method").Interface().(func(int32) int32) 2615 if x := m32(456); x != 456 { 2616 t.Errorf("Int32Method returned %d; want 456", x) 2617 } 2618} 2619 2620func TestVariadicMethodValue(t *testing.T) { 2621 p := Point{3, 4} 2622 points := []Point{{20, 21}, {22, 23}, {24, 25}} 2623 want := int64(p.TotalDist(points[0], points[1], points[2])) 2624 2625 // Variadic method of type. 2626 tfunc := TypeOf((func(Point, ...Point) int)(nil)) 2627 if tt := TypeOf(p).Method(4).Type; tt != tfunc { 2628 t.Errorf("Variadic Method Type from TypeOf is %s; want %s", tt, tfunc) 2629 } 2630 2631 // Curried method of value. 2632 tfunc = TypeOf((func(...Point) int)(nil)) 2633 v := ValueOf(p).Method(4) 2634 if tt := v.Type(); tt != tfunc { 2635 t.Errorf("Variadic Method Type is %s; want %s", tt, tfunc) 2636 } 2637 i := ValueOf(v.Interface()).Call([]Value{ValueOf(points[0]), ValueOf(points[1]), ValueOf(points[2])})[0].Int() 2638 if i != want { 2639 t.Errorf("Variadic Method returned %d; want %d", i, want) 2640 } 2641 i = ValueOf(v.Interface()).CallSlice([]Value{ValueOf(points)})[0].Int() 2642 if i != want { 2643 t.Errorf("Variadic Method CallSlice returned %d; want %d", i, want) 2644 } 2645 2646 f := v.Interface().(func(...Point) int) 2647 i = int64(f(points[0], points[1], points[2])) 2648 if i != want { 2649 t.Errorf("Variadic Method Interface returned %d; want %d", i, want) 2650 } 2651 i = int64(f(points...)) 2652 if i != want { 2653 t.Errorf("Variadic Method Interface Slice returned %d; want %d", i, want) 2654 } 2655} 2656 2657type DirectIfaceT struct { 2658 p *int 2659} 2660 2661func (d DirectIfaceT) M() int { return *d.p } 2662 2663func TestDirectIfaceMethod(t *testing.T) { 2664 x := 42 2665 v := DirectIfaceT{&x} 2666 typ := TypeOf(v) 2667 m, ok := typ.MethodByName("M") 2668 if !ok { 2669 t.Fatalf("cannot find method M") 2670 } 2671 in := []Value{ValueOf(v)} 2672 out := m.Func.Call(in) 2673 if got := out[0].Int(); got != 42 { 2674 t.Errorf("Call with value receiver got %d, want 42", got) 2675 } 2676 2677 pv := &v 2678 typ = TypeOf(pv) 2679 m, ok = typ.MethodByName("M") 2680 if !ok { 2681 t.Fatalf("cannot find method M") 2682 } 2683 in = []Value{ValueOf(pv)} 2684 out = m.Func.Call(in) 2685 if got := out[0].Int(); got != 42 { 2686 t.Errorf("Call with pointer receiver got %d, want 42", got) 2687 } 2688} 2689 2690// Reflect version of $GOROOT/test/method5.go 2691 2692// Concrete types implementing M method. 2693// Smaller than a word, word-sized, larger than a word. 2694// Value and pointer receivers. 2695 2696type Tinter interface { 2697 M(int, byte) (byte, int) 2698} 2699 2700type Tsmallv byte 2701 2702func (v Tsmallv) M(x int, b byte) (byte, int) { return b, x + int(v) } 2703 2704type Tsmallp byte 2705 2706func (p *Tsmallp) M(x int, b byte) (byte, int) { return b, x + int(*p) } 2707 2708type Twordv uintptr 2709 2710func (v Twordv) M(x int, b byte) (byte, int) { return b, x + int(v) } 2711 2712type Twordp uintptr 2713 2714func (p *Twordp) M(x int, b byte) (byte, int) { return b, x + int(*p) } 2715 2716type Tbigv [2]uintptr 2717 2718func (v Tbigv) M(x int, b byte) (byte, int) { return b, x + int(v[0]) + int(v[1]) } 2719 2720type Tbigp [2]uintptr 2721 2722func (p *Tbigp) M(x int, b byte) (byte, int) { return b, x + int(p[0]) + int(p[1]) } 2723 2724type tinter interface { 2725 m(int, byte) (byte, int) 2726} 2727 2728// Embedding via pointer. 2729 2730type Tm1 struct { 2731 Tm2 2732} 2733 2734type Tm2 struct { 2735 *Tm3 2736} 2737 2738type Tm3 struct { 2739 *Tm4 2740} 2741 2742type Tm4 struct { 2743} 2744 2745func (t4 Tm4) M(x int, b byte) (byte, int) { return b, x + 40 } 2746 2747func TestMethod5(t *testing.T) { 2748 CheckF := func(name string, f func(int, byte) (byte, int), inc int) { 2749 b, x := f(1000, 99) 2750 if b != 99 || x != 1000+inc { 2751 t.Errorf("%s(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc) 2752 } 2753 } 2754 2755 CheckV := func(name string, i Value, inc int) { 2756 bx := i.Method(0).Call([]Value{ValueOf(1000), ValueOf(byte(99))}) 2757 b := bx[0].Interface() 2758 x := bx[1].Interface() 2759 if b != byte(99) || x != 1000+inc { 2760 t.Errorf("direct %s.M(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc) 2761 } 2762 2763 CheckF(name+".M", i.Method(0).Interface().(func(int, byte) (byte, int)), inc) 2764 } 2765 2766 var TinterType = TypeOf(new(Tinter)).Elem() 2767 2768 CheckI := func(name string, i any, inc int) { 2769 v := ValueOf(i) 2770 CheckV(name, v, inc) 2771 CheckV("(i="+name+")", v.Convert(TinterType), inc) 2772 } 2773 2774 sv := Tsmallv(1) 2775 CheckI("sv", sv, 1) 2776 CheckI("&sv", &sv, 1) 2777 2778 sp := Tsmallp(2) 2779 CheckI("&sp", &sp, 2) 2780 2781 wv := Twordv(3) 2782 CheckI("wv", wv, 3) 2783 CheckI("&wv", &wv, 3) 2784 2785 wp := Twordp(4) 2786 CheckI("&wp", &wp, 4) 2787 2788 bv := Tbigv([2]uintptr{5, 6}) 2789 CheckI("bv", bv, 11) 2790 CheckI("&bv", &bv, 11) 2791 2792 bp := Tbigp([2]uintptr{7, 8}) 2793 CheckI("&bp", &bp, 15) 2794 2795 t4 := Tm4{} 2796 t3 := Tm3{&t4} 2797 t2 := Tm2{&t3} 2798 t1 := Tm1{t2} 2799 CheckI("t4", t4, 40) 2800 CheckI("&t4", &t4, 40) 2801 CheckI("t3", t3, 40) 2802 CheckI("&t3", &t3, 40) 2803 CheckI("t2", t2, 40) 2804 CheckI("&t2", &t2, 40) 2805 CheckI("t1", t1, 40) 2806 CheckI("&t1", &t1, 40) 2807 2808 var tnil Tinter 2809 vnil := ValueOf(&tnil).Elem() 2810 shouldPanic("Method", func() { vnil.Method(0) }) 2811} 2812 2813func TestInterfaceSet(t *testing.T) { 2814 p := &Point{3, 4} 2815 2816 var s struct { 2817 I any 2818 P interface { 2819 Dist(int) int 2820 } 2821 } 2822 sv := ValueOf(&s).Elem() 2823 sv.Field(0).Set(ValueOf(p)) 2824 if q := s.I.(*Point); q != p { 2825 t.Errorf("i: have %p want %p", q, p) 2826 } 2827 2828 pv := sv.Field(1) 2829 pv.Set(ValueOf(p)) 2830 if q := s.P.(*Point); q != p { 2831 t.Errorf("i: have %p want %p", q, p) 2832 } 2833 2834 i := pv.Method(0).Call([]Value{ValueOf(10)})[0].Int() 2835 if i != 250 { 2836 t.Errorf("Interface Method returned %d; want 250", i) 2837 } 2838} 2839 2840type T1 struct { 2841 a string 2842 int 2843} 2844 2845func TestAnonymousFields(t *testing.T) { 2846 var field StructField 2847 var ok bool 2848 var t1 T1 2849 type1 := TypeOf(t1) 2850 if field, ok = type1.FieldByName("int"); !ok { 2851 t.Fatal("no field 'int'") 2852 } 2853 if field.Index[0] != 1 { 2854 t.Error("field index should be 1; is", field.Index) 2855 } 2856} 2857 2858type FTest struct { 2859 s any 2860 name string 2861 index []int 2862 value int 2863} 2864 2865type D1 struct { 2866 d int 2867} 2868type D2 struct { 2869 d int 2870} 2871 2872type S0 struct { 2873 A, B, C int 2874 D1 2875 D2 2876} 2877 2878type S1 struct { 2879 B int 2880 S0 2881} 2882 2883type S2 struct { 2884 A int 2885 *S1 2886} 2887 2888type S1x struct { 2889 S1 2890} 2891 2892type S1y struct { 2893 S1 2894} 2895 2896type S3 struct { 2897 S1x 2898 S2 2899 D, E int 2900 *S1y 2901} 2902 2903type S4 struct { 2904 *S4 2905 A int 2906} 2907 2908// The X in S6 and S7 annihilate, but they also block the X in S8.S9. 2909type S5 struct { 2910 S6 2911 S7 2912 S8 2913} 2914 2915type S6 struct { 2916 X int 2917} 2918 2919type S7 S6 2920 2921type S8 struct { 2922 S9 2923} 2924 2925type S9 struct { 2926 X int 2927 Y int 2928} 2929 2930// The X in S11.S6 and S12.S6 annihilate, but they also block the X in S13.S8.S9. 2931type S10 struct { 2932 S11 2933 S12 2934 S13 2935} 2936 2937type S11 struct { 2938 S6 2939} 2940 2941type S12 struct { 2942 S6 2943} 2944 2945type S13 struct { 2946 S8 2947} 2948 2949// The X in S15.S11.S1 and S16.S11.S1 annihilate. 2950type S14 struct { 2951 S15 2952 S16 2953} 2954 2955type S15 struct { 2956 S11 2957} 2958 2959type S16 struct { 2960 S11 2961} 2962 2963var fieldTests = []FTest{ 2964 {struct{}{}, "", nil, 0}, 2965 {struct{}{}, "Foo", nil, 0}, 2966 {S0{A: 'a'}, "A", []int{0}, 'a'}, 2967 {S0{}, "D", nil, 0}, 2968 {S1{S0: S0{A: 'a'}}, "A", []int{1, 0}, 'a'}, 2969 {S1{B: 'b'}, "B", []int{0}, 'b'}, 2970 {S1{}, "S0", []int{1}, 0}, 2971 {S1{S0: S0{C: 'c'}}, "C", []int{1, 2}, 'c'}, 2972 {S2{A: 'a'}, "A", []int{0}, 'a'}, 2973 {S2{}, "S1", []int{1}, 0}, 2974 {S2{S1: &S1{B: 'b'}}, "B", []int{1, 0}, 'b'}, 2975 {S2{S1: &S1{S0: S0{C: 'c'}}}, "C", []int{1, 1, 2}, 'c'}, 2976 {S2{}, "D", nil, 0}, 2977 {S3{}, "S1", nil, 0}, 2978 {S3{S2: S2{A: 'a'}}, "A", []int{1, 0}, 'a'}, 2979 {S3{}, "B", nil, 0}, 2980 {S3{D: 'd'}, "D", []int{2}, 0}, 2981 {S3{E: 'e'}, "E", []int{3}, 'e'}, 2982 {S4{A: 'a'}, "A", []int{1}, 'a'}, 2983 {S4{}, "B", nil, 0}, 2984 {S5{}, "X", nil, 0}, 2985 {S5{}, "Y", []int{2, 0, 1}, 0}, 2986 {S10{}, "X", nil, 0}, 2987 {S10{}, "Y", []int{2, 0, 0, 1}, 0}, 2988 {S14{}, "X", nil, 0}, 2989} 2990 2991func TestFieldByIndex(t *testing.T) { 2992 for _, test := range fieldTests { 2993 s := TypeOf(test.s) 2994 f := s.FieldByIndex(test.index) 2995 if f.Name != "" { 2996 if test.index != nil { 2997 if f.Name != test.name { 2998 t.Errorf("%s.%s found; want %s", s.Name(), f.Name, test.name) 2999 } 3000 } else { 3001 t.Errorf("%s.%s found", s.Name(), f.Name) 3002 } 3003 } else if len(test.index) > 0 { 3004 t.Errorf("%s.%s not found", s.Name(), test.name) 3005 } 3006 3007 if test.value != 0 { 3008 v := ValueOf(test.s).FieldByIndex(test.index) 3009 if v.IsValid() { 3010 if x, ok := v.Interface().(int); ok { 3011 if x != test.value { 3012 t.Errorf("%s%v is %d; want %d", s.Name(), test.index, x, test.value) 3013 } 3014 } else { 3015 t.Errorf("%s%v value not an int", s.Name(), test.index) 3016 } 3017 } else { 3018 t.Errorf("%s%v value not found", s.Name(), test.index) 3019 } 3020 } 3021 } 3022} 3023 3024func TestFieldByName(t *testing.T) { 3025 for _, test := range fieldTests { 3026 s := TypeOf(test.s) 3027 f, found := s.FieldByName(test.name) 3028 if found { 3029 if test.index != nil { 3030 // Verify field depth and index. 3031 if len(f.Index) != len(test.index) { 3032 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) 3033 } else { 3034 for i, x := range f.Index { 3035 if x != test.index[i] { 3036 t.Errorf("%s.%s.Index[%d] is %d; want %d", s.Name(), test.name, i, x, test.index[i]) 3037 } 3038 } 3039 } 3040 } else { 3041 t.Errorf("%s.%s found", s.Name(), f.Name) 3042 } 3043 } else if len(test.index) > 0 { 3044 t.Errorf("%s.%s not found", s.Name(), test.name) 3045 } 3046 3047 if test.value != 0 { 3048 v := ValueOf(test.s).FieldByName(test.name) 3049 if v.IsValid() { 3050 if x, ok := v.Interface().(int); ok { 3051 if x != test.value { 3052 t.Errorf("%s.%s is %d; want %d", s.Name(), test.name, x, test.value) 3053 } 3054 } else { 3055 t.Errorf("%s.%s value not an int", s.Name(), test.name) 3056 } 3057 } else { 3058 t.Errorf("%s.%s value not found", s.Name(), test.name) 3059 } 3060 } 3061 } 3062} 3063 3064func TestImportPath(t *testing.T) { 3065 tests := []struct { 3066 t Type 3067 path string 3068 }{ 3069 {TypeOf(&base64.Encoding{}).Elem(), "encoding/base64"}, 3070 {TypeOf(int(0)), ""}, 3071 {TypeOf(int8(0)), ""}, 3072 {TypeOf(int16(0)), ""}, 3073 {TypeOf(int32(0)), ""}, 3074 {TypeOf(int64(0)), ""}, 3075 {TypeOf(uint(0)), ""}, 3076 {TypeOf(uint8(0)), ""}, 3077 {TypeOf(uint16(0)), ""}, 3078 {TypeOf(uint32(0)), ""}, 3079 {TypeOf(uint64(0)), ""}, 3080 {TypeOf(uintptr(0)), ""}, 3081 {TypeOf(float32(0)), ""}, 3082 {TypeOf(float64(0)), ""}, 3083 {TypeOf(complex64(0)), ""}, 3084 {TypeOf(complex128(0)), ""}, 3085 {TypeOf(byte(0)), ""}, 3086 {TypeOf(rune(0)), ""}, 3087 {TypeOf([]byte(nil)), ""}, 3088 {TypeOf([]rune(nil)), ""}, 3089 {TypeOf(string("")), ""}, 3090 {TypeOf((*any)(nil)).Elem(), ""}, 3091 {TypeOf((*byte)(nil)), ""}, 3092 {TypeOf((*rune)(nil)), ""}, 3093 {TypeOf((*int64)(nil)), ""}, 3094 {TypeOf(map[string]int{}), ""}, 3095 {TypeOf((*error)(nil)).Elem(), ""}, 3096 {TypeOf((*Point)(nil)), ""}, 3097 {TypeOf((*Point)(nil)).Elem(), "reflect_test"}, 3098 } 3099 for _, test := range tests { 3100 if path := test.t.PkgPath(); path != test.path { 3101 t.Errorf("%v.PkgPath() = %q, want %q", test.t, path, test.path) 3102 } 3103 } 3104} 3105 3106func TestFieldPkgPath(t *testing.T) { 3107 type x int 3108 typ := TypeOf(struct { 3109 Exported string 3110 unexported string 3111 OtherPkgFields 3112 int // issue 21702 3113 *x // issue 21122 3114 }{}) 3115 3116 type pkgpathTest struct { 3117 index []int 3118 pkgPath string 3119 embedded bool 3120 exported bool 3121 } 3122 3123 checkPkgPath := func(name string, s []pkgpathTest) { 3124 for _, test := range s { 3125 f := typ.FieldByIndex(test.index) 3126 if got, want := f.PkgPath, test.pkgPath; got != want { 3127 t.Errorf("%s: Field(%d).PkgPath = %q, want %q", name, test.index, got, want) 3128 } 3129 if got, want := f.Anonymous, test.embedded; got != want { 3130 t.Errorf("%s: Field(%d).Anonymous = %v, want %v", name, test.index, got, want) 3131 } 3132 if got, want := f.IsExported(), test.exported; got != want { 3133 t.Errorf("%s: Field(%d).IsExported = %v, want %v", name, test.index, got, want) 3134 } 3135 } 3136 } 3137 3138 checkPkgPath("testStruct", []pkgpathTest{ 3139 {[]int{0}, "", false, true}, // Exported 3140 {[]int{1}, "reflect_test", false, false}, // unexported 3141 {[]int{2}, "", true, true}, // OtherPkgFields 3142 {[]int{2, 0}, "", false, true}, // OtherExported 3143 {[]int{2, 1}, "reflect", false, false}, // otherUnexported 3144 {[]int{3}, "reflect_test", true, false}, // int 3145 {[]int{4}, "reflect_test", true, false}, // *x 3146 }) 3147 3148 type localOtherPkgFields OtherPkgFields 3149 typ = TypeOf(localOtherPkgFields{}) 3150 checkPkgPath("localOtherPkgFields", []pkgpathTest{ 3151 {[]int{0}, "", false, true}, // OtherExported 3152 {[]int{1}, "reflect", false, false}, // otherUnexported 3153 }) 3154} 3155 3156func TestMethodPkgPath(t *testing.T) { 3157 type I interface { 3158 x() 3159 X() 3160 } 3161 typ := TypeOf((*interface { 3162 I 3163 y() 3164 Y() 3165 })(nil)).Elem() 3166 3167 tests := []struct { 3168 name string 3169 pkgPath string 3170 exported bool 3171 }{ 3172 {"X", "", true}, 3173 {"Y", "", true}, 3174 {"x", "reflect_test", false}, 3175 {"y", "reflect_test", false}, 3176 } 3177 3178 for _, test := range tests { 3179 m, _ := typ.MethodByName(test.name) 3180 if got, want := m.PkgPath, test.pkgPath; got != want { 3181 t.Errorf("MethodByName(%q).PkgPath = %q, want %q", test.name, got, want) 3182 } 3183 if got, want := m.IsExported(), test.exported; got != want { 3184 t.Errorf("MethodByName(%q).IsExported = %v, want %v", test.name, got, want) 3185 } 3186 } 3187} 3188 3189func TestVariadicType(t *testing.T) { 3190 // Test example from Type documentation. 3191 var f func(x int, y ...float64) 3192 typ := TypeOf(f) 3193 if typ.NumIn() == 2 && typ.In(0) == TypeOf(int(0)) { 3194 sl := typ.In(1) 3195 if sl.Kind() == Slice { 3196 if sl.Elem() == TypeOf(0.0) { 3197 // ok 3198 return 3199 } 3200 } 3201 } 3202 3203 // Failed 3204 t.Errorf("want NumIn() = 2, In(0) = int, In(1) = []float64") 3205 s := fmt.Sprintf("have NumIn() = %d", typ.NumIn()) 3206 for i := 0; i < typ.NumIn(); i++ { 3207 s += fmt.Sprintf(", In(%d) = %s", i, typ.In(i)) 3208 } 3209 t.Error(s) 3210} 3211 3212type inner struct { 3213 x int 3214} 3215 3216type outer struct { 3217 y int 3218 inner 3219} 3220 3221func (*inner) M() {} 3222func (*outer) M() {} 3223 3224func TestNestedMethods(t *testing.T) { 3225 typ := TypeOf((*outer)(nil)) 3226 if typ.NumMethod() != 1 || typ.Method(0).Func.UnsafePointer() != ValueOf((*outer).M).UnsafePointer() { 3227 t.Errorf("Wrong method table for outer: (M=%p)", (*outer).M) 3228 for i := 0; i < typ.NumMethod(); i++ { 3229 m := typ.Method(i) 3230 t.Errorf("\t%d: %s %p\n", i, m.Name, m.Func.UnsafePointer()) 3231 } 3232 } 3233} 3234 3235type unexp struct{} 3236 3237func (*unexp) f() (int32, int8) { return 7, 7 } 3238func (*unexp) g() (int64, int8) { return 8, 8 } 3239 3240type unexpI interface { 3241 f() (int32, int8) 3242} 3243 3244var unexpi unexpI = new(unexp) 3245 3246func TestUnexportedMethods(t *testing.T) { 3247 typ := TypeOf(unexpi) 3248 3249 if got := typ.NumMethod(); got != 0 { 3250 t.Errorf("NumMethod=%d, want 0 satisfied methods", got) 3251 } 3252} 3253 3254type InnerInt struct { 3255 X int 3256} 3257 3258type OuterInt struct { 3259 Y int 3260 InnerInt 3261} 3262 3263func (i *InnerInt) M() int { 3264 return i.X 3265} 3266 3267func TestEmbeddedMethods(t *testing.T) { 3268 typ := TypeOf((*OuterInt)(nil)) 3269 if typ.NumMethod() != 1 || typ.Method(0).Func.UnsafePointer() != ValueOf((*OuterInt).M).UnsafePointer() { 3270 t.Errorf("Wrong method table for OuterInt: (m=%p)", (*OuterInt).M) 3271 for i := 0; i < typ.NumMethod(); i++ { 3272 m := typ.Method(i) 3273 t.Errorf("\t%d: %s %p\n", i, m.Name, m.Func.UnsafePointer()) 3274 } 3275 } 3276 3277 i := &InnerInt{3} 3278 if v := ValueOf(i).Method(0).Call(nil)[0].Int(); v != 3 { 3279 t.Errorf("i.M() = %d, want 3", v) 3280 } 3281 3282 o := &OuterInt{1, InnerInt{2}} 3283 if v := ValueOf(o).Method(0).Call(nil)[0].Int(); v != 2 { 3284 t.Errorf("i.M() = %d, want 2", v) 3285 } 3286 3287 f := (*OuterInt).M 3288 if v := f(o); v != 2 { 3289 t.Errorf("f(o) = %d, want 2", v) 3290 } 3291} 3292 3293type FuncDDD func(...any) error 3294 3295func (f FuncDDD) M() {} 3296 3297func TestNumMethodOnDDD(t *testing.T) { 3298 rv := ValueOf((FuncDDD)(nil)) 3299 if n := rv.NumMethod(); n != 1 { 3300 t.Fatalf("NumMethod()=%d, want 1", n) 3301 } 3302} 3303 3304func TestPtrTo(t *testing.T) { 3305 // This block of code means that the ptrToThis field of the 3306 // reflect data for *unsafe.Pointer is non zero, see 3307 // https://golang.org/issue/19003 3308 var x unsafe.Pointer 3309 var y = &x 3310 var z = &y 3311 3312 var i int 3313 3314 typ := TypeOf(z) 3315 for i = 0; i < 100; i++ { 3316 typ = PointerTo(typ) 3317 } 3318 for i = 0; i < 100; i++ { 3319 typ = typ.Elem() 3320 } 3321 if typ != TypeOf(z) { 3322 t.Errorf("after 100 PointerTo and Elem, have %s, want %s", typ, TypeOf(z)) 3323 } 3324} 3325 3326func TestPtrToGC(t *testing.T) { 3327 type T *uintptr 3328 tt := TypeOf(T(nil)) 3329 pt := PointerTo(tt) 3330 const n = 100 3331 var x []any 3332 for i := 0; i < n; i++ { 3333 v := New(pt) 3334 p := new(*uintptr) 3335 *p = new(uintptr) 3336 **p = uintptr(i) 3337 v.Elem().Set(ValueOf(p).Convert(pt)) 3338 x = append(x, v.Interface()) 3339 } 3340 runtime.GC() 3341 3342 for i, xi := range x { 3343 k := ValueOf(xi).Elem().Elem().Elem().Interface().(uintptr) 3344 if k != uintptr(i) { 3345 t.Errorf("lost x[%d] = %d, want %d", i, k, i) 3346 } 3347 } 3348} 3349 3350func BenchmarkPtrTo(b *testing.B) { 3351 // Construct a type with a zero ptrToThis. 3352 type T struct{ int } 3353 t := SliceOf(TypeOf(T{})) 3354 ptrToThis := ValueOf(t).Elem().FieldByName("ptrToThis") 3355 if !ptrToThis.IsValid() { 3356 b.Fatalf("%v has no ptrToThis field; was it removed from rtype?", t) 3357 } 3358 if ptrToThis.Int() != 0 { 3359 b.Fatalf("%v.ptrToThis unexpectedly nonzero", t) 3360 } 3361 b.ResetTimer() 3362 3363 // Now benchmark calling PointerTo on it: we'll have to hit the ptrMap cache on 3364 // every call. 3365 b.RunParallel(func(pb *testing.PB) { 3366 for pb.Next() { 3367 PointerTo(t) 3368 } 3369 }) 3370} 3371 3372func TestAddr(t *testing.T) { 3373 var p struct { 3374 X, Y int 3375 } 3376 3377 v := ValueOf(&p) 3378 v = v.Elem() 3379 v = v.Addr() 3380 v = v.Elem() 3381 v = v.Field(0) 3382 v.SetInt(2) 3383 if p.X != 2 { 3384 t.Errorf("Addr.Elem.Set failed to set value") 3385 } 3386 3387 // Again but take address of the ValueOf value. 3388 // Exercises generation of PtrTypes not present in the binary. 3389 q := &p 3390 v = ValueOf(&q).Elem() 3391 v = v.Addr() 3392 v = v.Elem() 3393 v = v.Elem() 3394 v = v.Addr() 3395 v = v.Elem() 3396 v = v.Field(0) 3397 v.SetInt(3) 3398 if p.X != 3 { 3399 t.Errorf("Addr.Elem.Set failed to set value") 3400 } 3401 3402 // Starting without pointer we should get changed value 3403 // in interface. 3404 qq := p 3405 v = ValueOf(&qq).Elem() 3406 v0 := v 3407 v = v.Addr() 3408 v = v.Elem() 3409 v = v.Field(0) 3410 v.SetInt(4) 3411 if p.X != 3 { // should be unchanged from last time 3412 t.Errorf("somehow value Set changed original p") 3413 } 3414 p = v0.Interface().(struct { 3415 X, Y int 3416 }) 3417 if p.X != 4 { 3418 t.Errorf("Addr.Elem.Set valued to set value in top value") 3419 } 3420 3421 // Verify that taking the address of a type gives us a pointer 3422 // which we can convert back using the usual interface 3423 // notation. 3424 var s struct { 3425 B *bool 3426 } 3427 ps := ValueOf(&s).Elem().Field(0).Addr().Interface() 3428 *(ps.(**bool)) = new(bool) 3429 if s.B == nil { 3430 t.Errorf("Addr.Interface direct assignment failed") 3431 } 3432} 3433 3434func noAlloc(t *testing.T, n int, f func(int)) { 3435 if testing.Short() { 3436 t.Skip("skipping malloc count in short mode") 3437 } 3438 if runtime.GOMAXPROCS(0) > 1 { 3439 t.Skip("skipping; GOMAXPROCS>1") 3440 } 3441 i := -1 3442 allocs := testing.AllocsPerRun(n, func() { 3443 f(i) 3444 i++ 3445 }) 3446 if allocs > 0 { 3447 t.Errorf("%d iterations: got %v mallocs, want 0", n, allocs) 3448 } 3449} 3450 3451func TestAllocations(t *testing.T) { 3452 noAlloc(t, 100, func(j int) { 3453 var i any 3454 var v Value 3455 3456 // We can uncomment this when compiler escape analysis 3457 // is good enough to see that the integer assigned to i 3458 // does not escape and therefore need not be allocated. 3459 // 3460 // i = 42 + j 3461 // v = ValueOf(i) 3462 // if int(v.Int()) != 42+j { 3463 // panic("wrong int") 3464 // } 3465 3466 i = func(j int) int { return j } 3467 v = ValueOf(i) 3468 if v.Interface().(func(int) int)(j) != j { 3469 panic("wrong result") 3470 } 3471 }) 3472} 3473 3474func TestSmallNegativeInt(t *testing.T) { 3475 i := int16(-1) 3476 v := ValueOf(i) 3477 if v.Int() != -1 { 3478 t.Errorf("int16(-1).Int() returned %v", v.Int()) 3479 } 3480} 3481 3482func TestIndex(t *testing.T) { 3483 xs := []byte{1, 2, 3, 4, 5, 6, 7, 8} 3484 v := ValueOf(xs).Index(3).Interface().(byte) 3485 if v != xs[3] { 3486 t.Errorf("xs.Index(3) = %v; expected %v", v, xs[3]) 3487 } 3488 xa := [8]byte{10, 20, 30, 40, 50, 60, 70, 80} 3489 v = ValueOf(xa).Index(2).Interface().(byte) 3490 if v != xa[2] { 3491 t.Errorf("xa.Index(2) = %v; expected %v", v, xa[2]) 3492 } 3493 s := "0123456789" 3494 v = ValueOf(s).Index(3).Interface().(byte) 3495 if v != s[3] { 3496 t.Errorf("s.Index(3) = %v; expected %v", v, s[3]) 3497 } 3498} 3499 3500func TestSlice(t *testing.T) { 3501 xs := []int{1, 2, 3, 4, 5, 6, 7, 8} 3502 v := ValueOf(xs).Slice(3, 5).Interface().([]int) 3503 if len(v) != 2 { 3504 t.Errorf("len(xs.Slice(3, 5)) = %d", len(v)) 3505 } 3506 if cap(v) != 5 { 3507 t.Errorf("cap(xs.Slice(3, 5)) = %d", cap(v)) 3508 } 3509 if !DeepEqual(v[0:5], xs[3:]) { 3510 t.Errorf("xs.Slice(3, 5)[0:5] = %v", v[0:5]) 3511 } 3512 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} 3513 v = ValueOf(&xa).Elem().Slice(2, 5).Interface().([]int) 3514 if len(v) != 3 { 3515 t.Errorf("len(xa.Slice(2, 5)) = %d", len(v)) 3516 } 3517 if cap(v) != 6 { 3518 t.Errorf("cap(xa.Slice(2, 5)) = %d", cap(v)) 3519 } 3520 if !DeepEqual(v[0:6], xa[2:]) { 3521 t.Errorf("xs.Slice(2, 5)[0:6] = %v", v[0:6]) 3522 } 3523 s := "0123456789" 3524 vs := ValueOf(s).Slice(3, 5).Interface().(string) 3525 if vs != s[3:5] { 3526 t.Errorf("s.Slice(3, 5) = %q; expected %q", vs, s[3:5]) 3527 } 3528 3529 rv := ValueOf(&xs).Elem() 3530 rv = rv.Slice(3, 4) 3531 ptr2 := rv.UnsafePointer() 3532 rv = rv.Slice(5, 5) 3533 ptr3 := rv.UnsafePointer() 3534 if ptr3 != ptr2 { 3535 t.Errorf("xs.Slice(3,4).Slice3(5,5).UnsafePointer() = %p, want %p", ptr3, ptr2) 3536 } 3537} 3538 3539func TestSlice3(t *testing.T) { 3540 xs := []int{1, 2, 3, 4, 5, 6, 7, 8} 3541 v := ValueOf(xs).Slice3(3, 5, 7).Interface().([]int) 3542 if len(v) != 2 { 3543 t.Errorf("len(xs.Slice3(3, 5, 7)) = %d", len(v)) 3544 } 3545 if cap(v) != 4 { 3546 t.Errorf("cap(xs.Slice3(3, 5, 7)) = %d", cap(v)) 3547 } 3548 if !DeepEqual(v[0:4], xs[3:7:7]) { 3549 t.Errorf("xs.Slice3(3, 5, 7)[0:4] = %v", v[0:4]) 3550 } 3551 rv := ValueOf(&xs).Elem() 3552 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) }) 3553 shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) }) 3554 shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) }) 3555 3556 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} 3557 v = ValueOf(&xa).Elem().Slice3(2, 5, 6).Interface().([]int) 3558 if len(v) != 3 { 3559 t.Errorf("len(xa.Slice(2, 5, 6)) = %d", len(v)) 3560 } 3561 if cap(v) != 4 { 3562 t.Errorf("cap(xa.Slice(2, 5, 6)) = %d", cap(v)) 3563 } 3564 if !DeepEqual(v[0:4], xa[2:6:6]) { 3565 t.Errorf("xs.Slice(2, 5, 6)[0:4] = %v", v[0:4]) 3566 } 3567 rv = ValueOf(&xa).Elem() 3568 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) }) 3569 shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) }) 3570 shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) }) 3571 3572 s := "hello world" 3573 rv = ValueOf(&s).Elem() 3574 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 3) }) 3575 3576 rv = ValueOf(&xs).Elem() 3577 rv = rv.Slice3(3, 5, 7) 3578 ptr2 := rv.UnsafePointer() 3579 rv = rv.Slice3(4, 4, 4) 3580 ptr3 := rv.UnsafePointer() 3581 if ptr3 != ptr2 { 3582 t.Errorf("xs.Slice3(3,5,7).Slice3(4,4,4).UnsafePointer() = %p, want %p", ptr3, ptr2) 3583 } 3584} 3585 3586func TestSetLenCap(t *testing.T) { 3587 xs := []int{1, 2, 3, 4, 5, 6, 7, 8} 3588 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} 3589 3590 vs := ValueOf(&xs).Elem() 3591 shouldPanic("SetLen", func() { vs.SetLen(10) }) 3592 shouldPanic("SetCap", func() { vs.SetCap(10) }) 3593 shouldPanic("SetLen", func() { vs.SetLen(-1) }) 3594 shouldPanic("SetCap", func() { vs.SetCap(-1) }) 3595 shouldPanic("SetCap", func() { vs.SetCap(6) }) // smaller than len 3596 vs.SetLen(5) 3597 if len(xs) != 5 || cap(xs) != 8 { 3598 t.Errorf("after SetLen(5), len, cap = %d, %d, want 5, 8", len(xs), cap(xs)) 3599 } 3600 vs.SetCap(6) 3601 if len(xs) != 5 || cap(xs) != 6 { 3602 t.Errorf("after SetCap(6), len, cap = %d, %d, want 5, 6", len(xs), cap(xs)) 3603 } 3604 vs.SetCap(5) 3605 if len(xs) != 5 || cap(xs) != 5 { 3606 t.Errorf("after SetCap(5), len, cap = %d, %d, want 5, 5", len(xs), cap(xs)) 3607 } 3608 shouldPanic("SetCap", func() { vs.SetCap(4) }) // smaller than len 3609 shouldPanic("SetLen", func() { vs.SetLen(6) }) // bigger than cap 3610 3611 va := ValueOf(&xa).Elem() 3612 shouldPanic("SetLen", func() { va.SetLen(8) }) 3613 shouldPanic("SetCap", func() { va.SetCap(8) }) 3614} 3615 3616func TestVariadic(t *testing.T) { 3617 var b bytes.Buffer 3618 V := ValueOf 3619 3620 b.Reset() 3621 V(fmt.Fprintf).Call([]Value{V(&b), V("%s, %d world"), V("hello"), V(42)}) 3622 if b.String() != "hello, 42 world" { 3623 t.Errorf("after Fprintf Call: %q != %q", b.String(), "hello 42 world") 3624 } 3625 3626 b.Reset() 3627 V(fmt.Fprintf).CallSlice([]Value{V(&b), V("%s, %d world"), V([]any{"hello", 42})}) 3628 if b.String() != "hello, 42 world" { 3629 t.Errorf("after Fprintf CallSlice: %q != %q", b.String(), "hello 42 world") 3630 } 3631} 3632 3633func TestFuncArg(t *testing.T) { 3634 f1 := func(i int, f func(int) int) int { return f(i) } 3635 f2 := func(i int) int { return i + 1 } 3636 r := ValueOf(f1).Call([]Value{ValueOf(100), ValueOf(f2)}) 3637 if r[0].Int() != 101 { 3638 t.Errorf("function returned %d, want 101", r[0].Int()) 3639 } 3640} 3641 3642func TestStructArg(t *testing.T) { 3643 type padded struct { 3644 B string 3645 C int32 3646 } 3647 var ( 3648 gotA padded 3649 gotB uint32 3650 wantA = padded{"3", 4} 3651 wantB = uint32(5) 3652 ) 3653 f := func(a padded, b uint32) { 3654 gotA, gotB = a, b 3655 } 3656 ValueOf(f).Call([]Value{ValueOf(wantA), ValueOf(wantB)}) 3657 if gotA != wantA || gotB != wantB { 3658 t.Errorf("function called with (%v, %v), want (%v, %v)", gotA, gotB, wantA, wantB) 3659 } 3660} 3661 3662var tagGetTests = []struct { 3663 Tag StructTag 3664 Key string 3665 Value string 3666}{ 3667 {`protobuf:"PB(1,2)"`, `protobuf`, `PB(1,2)`}, 3668 {`protobuf:"PB(1,2)"`, `foo`, ``}, 3669 {`protobuf:"PB(1,2)"`, `rotobuf`, ``}, 3670 {`protobuf:"PB(1,2)" json:"name"`, `json`, `name`}, 3671 {`protobuf:"PB(1,2)" json:"name"`, `protobuf`, `PB(1,2)`}, 3672 {`k0:"values contain spaces" k1:"and\ttabs"`, "k0", "values contain spaces"}, 3673 {`k0:"values contain spaces" k1:"and\ttabs"`, "k1", "and\ttabs"}, 3674} 3675 3676func TestTagGet(t *testing.T) { 3677 for _, tt := range tagGetTests { 3678 if v := tt.Tag.Get(tt.Key); v != tt.Value { 3679 t.Errorf("StructTag(%#q).Get(%#q) = %#q, want %#q", tt.Tag, tt.Key, v, tt.Value) 3680 } 3681 } 3682} 3683 3684func TestBytes(t *testing.T) { 3685 type B []byte 3686 x := B{1, 2, 3, 4} 3687 y := ValueOf(x).Bytes() 3688 if !bytes.Equal(x, y) { 3689 t.Fatalf("ValueOf(%v).Bytes() = %v", x, y) 3690 } 3691 if &x[0] != &y[0] { 3692 t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0]) 3693 } 3694} 3695 3696func TestSetBytes(t *testing.T) { 3697 type B []byte 3698 var x B 3699 y := []byte{1, 2, 3, 4} 3700 ValueOf(&x).Elem().SetBytes(y) 3701 if !bytes.Equal(x, y) { 3702 t.Fatalf("ValueOf(%v).Bytes() = %v", x, y) 3703 } 3704 if &x[0] != &y[0] { 3705 t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0]) 3706 } 3707} 3708 3709type Private struct { 3710 x int 3711 y **int 3712 Z int 3713} 3714 3715func (p *Private) m() { 3716} 3717 3718type private struct { 3719 Z int 3720 z int 3721 S string 3722 A [1]Private 3723 T []Private 3724} 3725 3726func (p *private) P() { 3727} 3728 3729type Public struct { 3730 X int 3731 Y **int 3732 private 3733} 3734 3735func (p *Public) M() { 3736} 3737 3738func TestUnexported(t *testing.T) { 3739 var pub Public 3740 pub.S = "S" 3741 pub.T = pub.A[:] 3742 v := ValueOf(&pub) 3743 isValid(v.Elem().Field(0)) 3744 isValid(v.Elem().Field(1)) 3745 isValid(v.Elem().Field(2)) 3746 isValid(v.Elem().FieldByName("X")) 3747 isValid(v.Elem().FieldByName("Y")) 3748 isValid(v.Elem().FieldByName("Z")) 3749 isValid(v.Type().Method(0).Func) 3750 m, _ := v.Type().MethodByName("M") 3751 isValid(m.Func) 3752 m, _ = v.Type().MethodByName("P") 3753 isValid(m.Func) 3754 isNonNil(v.Elem().Field(0).Interface()) 3755 isNonNil(v.Elem().Field(1).Interface()) 3756 isNonNil(v.Elem().Field(2).Field(2).Index(0)) 3757 isNonNil(v.Elem().FieldByName("X").Interface()) 3758 isNonNil(v.Elem().FieldByName("Y").Interface()) 3759 isNonNil(v.Elem().FieldByName("Z").Interface()) 3760 isNonNil(v.Elem().FieldByName("S").Index(0).Interface()) 3761 isNonNil(v.Type().Method(0).Func.Interface()) 3762 m, _ = v.Type().MethodByName("P") 3763 isNonNil(m.Func.Interface()) 3764 3765 var priv Private 3766 v = ValueOf(&priv) 3767 isValid(v.Elem().Field(0)) 3768 isValid(v.Elem().Field(1)) 3769 isValid(v.Elem().FieldByName("x")) 3770 isValid(v.Elem().FieldByName("y")) 3771 shouldPanic("Interface", func() { v.Elem().Field(0).Interface() }) 3772 shouldPanic("Interface", func() { v.Elem().Field(1).Interface() }) 3773 shouldPanic("Interface", func() { v.Elem().FieldByName("x").Interface() }) 3774 shouldPanic("Interface", func() { v.Elem().FieldByName("y").Interface() }) 3775 shouldPanic("Method", func() { v.Type().Method(0) }) 3776} 3777 3778func TestSetPanic(t *testing.T) { 3779 ok := func(f func()) { f() } 3780 bad := func(f func()) { shouldPanic("Set", f) } 3781 clear := func(v Value) { v.Set(Zero(v.Type())) } 3782 3783 type t0 struct { 3784 W int 3785 } 3786 3787 type t1 struct { 3788 Y int 3789 t0 3790 } 3791 3792 type T2 struct { 3793 Z int 3794 namedT0 t0 3795 } 3796 3797 type T struct { 3798 X int 3799 t1 3800 T2 3801 NamedT1 t1 3802 NamedT2 T2 3803 namedT1 t1 3804 namedT2 T2 3805 } 3806 3807 // not addressable 3808 v := ValueOf(T{}) 3809 bad(func() { clear(v.Field(0)) }) // .X 3810 bad(func() { clear(v.Field(1)) }) // .t1 3811 bad(func() { clear(v.Field(1).Field(0)) }) // .t1.Y 3812 bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0 3813 bad(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W 3814 bad(func() { clear(v.Field(2)) }) // .T2 3815 bad(func() { clear(v.Field(2).Field(0)) }) // .T2.Z 3816 bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0 3817 bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W 3818 bad(func() { clear(v.Field(3)) }) // .NamedT1 3819 bad(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y 3820 bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0 3821 bad(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W 3822 bad(func() { clear(v.Field(4)) }) // .NamedT2 3823 bad(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z 3824 bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0 3825 bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W 3826 bad(func() { clear(v.Field(5)) }) // .namedT1 3827 bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y 3828 bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0 3829 bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W 3830 bad(func() { clear(v.Field(6)) }) // .namedT2 3831 bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z 3832 bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0 3833 bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W 3834 3835 // addressable 3836 v = ValueOf(&T{}).Elem() 3837 ok(func() { clear(v.Field(0)) }) // .X 3838 bad(func() { clear(v.Field(1)) }) // .t1 3839 ok(func() { clear(v.Field(1).Field(0)) }) // .t1.Y 3840 bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0 3841 ok(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W 3842 ok(func() { clear(v.Field(2)) }) // .T2 3843 ok(func() { clear(v.Field(2).Field(0)) }) // .T2.Z 3844 bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0 3845 bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W 3846 ok(func() { clear(v.Field(3)) }) // .NamedT1 3847 ok(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y 3848 bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0 3849 ok(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W 3850 ok(func() { clear(v.Field(4)) }) // .NamedT2 3851 ok(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z 3852 bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0 3853 bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W 3854 bad(func() { clear(v.Field(5)) }) // .namedT1 3855 bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y 3856 bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0 3857 bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W 3858 bad(func() { clear(v.Field(6)) }) // .namedT2 3859 bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z 3860 bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0 3861 bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W 3862} 3863 3864type timp int 3865 3866func (t timp) W() {} 3867func (t timp) Y() {} 3868func (t timp) w() {} 3869func (t timp) y() {} 3870 3871func TestCallPanic(t *testing.T) { 3872 type t0 interface { 3873 W() 3874 w() 3875 } 3876 type T1 interface { 3877 Y() 3878 y() 3879 } 3880 type T2 struct { 3881 T1 3882 t0 3883 } 3884 type T struct { 3885 t0 // 0 3886 T1 // 1 3887 3888 NamedT0 t0 // 2 3889 NamedT1 T1 // 3 3890 NamedT2 T2 // 4 3891 3892 namedT0 t0 // 5 3893 namedT1 T1 // 6 3894 namedT2 T2 // 7 3895 } 3896 ok := func(f func()) { f() } 3897 badCall := func(f func()) { shouldPanic("Call", f) } 3898 badMethod := func(f func()) { shouldPanic("Method", f) } 3899 call := func(v Value) { v.Call(nil) } 3900 3901 i := timp(0) 3902 v := ValueOf(T{i, i, i, i, T2{i, i}, i, i, T2{i, i}}) 3903 badCall(func() { call(v.Field(0).Method(0)) }) // .t0.W 3904 badCall(func() { call(v.Field(0).Elem().Method(0)) }) // .t0.W 3905 badCall(func() { call(v.Field(0).Method(1)) }) // .t0.w 3906 badMethod(func() { call(v.Field(0).Elem().Method(2)) }) // .t0.w 3907 ok(func() { call(v.Field(1).Method(0)) }) // .T1.Y 3908 ok(func() { call(v.Field(1).Elem().Method(0)) }) // .T1.Y 3909 badCall(func() { call(v.Field(1).Method(1)) }) // .T1.y 3910 badMethod(func() { call(v.Field(1).Elem().Method(2)) }) // .T1.y 3911 3912 ok(func() { call(v.Field(2).Method(0)) }) // .NamedT0.W 3913 ok(func() { call(v.Field(2).Elem().Method(0)) }) // .NamedT0.W 3914 badCall(func() { call(v.Field(2).Method(1)) }) // .NamedT0.w 3915 badMethod(func() { call(v.Field(2).Elem().Method(2)) }) // .NamedT0.w 3916 3917 ok(func() { call(v.Field(3).Method(0)) }) // .NamedT1.Y 3918 ok(func() { call(v.Field(3).Elem().Method(0)) }) // .NamedT1.Y 3919 badCall(func() { call(v.Field(3).Method(1)) }) // .NamedT1.y 3920 badMethod(func() { call(v.Field(3).Elem().Method(3)) }) // .NamedT1.y 3921 3922 ok(func() { call(v.Field(4).Field(0).Method(0)) }) // .NamedT2.T1.Y 3923 ok(func() { call(v.Field(4).Field(0).Elem().Method(0)) }) // .NamedT2.T1.W 3924 badCall(func() { call(v.Field(4).Field(1).Method(0)) }) // .NamedT2.t0.W 3925 badCall(func() { call(v.Field(4).Field(1).Elem().Method(0)) }) // .NamedT2.t0.W 3926 3927 badCall(func() { call(v.Field(5).Method(0)) }) // .namedT0.W 3928 badCall(func() { call(v.Field(5).Elem().Method(0)) }) // .namedT0.W 3929 badCall(func() { call(v.Field(5).Method(1)) }) // .namedT0.w 3930 badMethod(func() { call(v.Field(5).Elem().Method(2)) }) // .namedT0.w 3931 3932 badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.Y 3933 badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.Y 3934 badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.y 3935 badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.y 3936 3937 badCall(func() { call(v.Field(7).Field(0).Method(0)) }) // .namedT2.T1.Y 3938 badCall(func() { call(v.Field(7).Field(0).Elem().Method(0)) }) // .namedT2.T1.W 3939 badCall(func() { call(v.Field(7).Field(1).Method(0)) }) // .namedT2.t0.W 3940 badCall(func() { call(v.Field(7).Field(1).Elem().Method(0)) }) // .namedT2.t0.W 3941} 3942 3943func shouldPanic(expect string, f func()) { 3944 defer func() { 3945 r := recover() 3946 if r == nil { 3947 panic("did not panic") 3948 } 3949 if expect != "" { 3950 var s string 3951 switch r := r.(type) { 3952 case string: 3953 s = r 3954 case *ValueError: 3955 s = r.Error() 3956 default: 3957 panic(fmt.Sprintf("panicked with unexpected type %T", r)) 3958 } 3959 if !strings.HasPrefix(s, "reflect") { 3960 panic(`panic string does not start with "reflect": ` + s) 3961 } 3962 if !strings.Contains(s, expect) { 3963 panic(`panic string does not contain "` + expect + `": ` + s) 3964 } 3965 } 3966 }() 3967 f() 3968} 3969 3970func isNonNil(x any) { 3971 if x == nil { 3972 panic("nil interface") 3973 } 3974} 3975 3976func isValid(v Value) { 3977 if !v.IsValid() { 3978 panic("zero Value") 3979 } 3980} 3981 3982func TestAlias(t *testing.T) { 3983 x := string("hello") 3984 v := ValueOf(&x).Elem() 3985 oldvalue := v.Interface() 3986 v.SetString("world") 3987 newvalue := v.Interface() 3988 3989 if oldvalue != "hello" || newvalue != "world" { 3990 t.Errorf("aliasing: old=%q new=%q, want hello, world", oldvalue, newvalue) 3991 } 3992} 3993 3994var V = ValueOf 3995 3996func EmptyInterfaceV(x any) Value { 3997 return ValueOf(&x).Elem() 3998} 3999 4000func ReaderV(x io.Reader) Value { 4001 return ValueOf(&x).Elem() 4002} 4003 4004func ReadWriterV(x io.ReadWriter) Value { 4005 return ValueOf(&x).Elem() 4006} 4007 4008type Empty struct{} 4009type MyStruct struct { 4010 x int `some:"tag"` 4011} 4012type MyStruct1 struct { 4013 x struct { 4014 int `some:"bar"` 4015 } 4016} 4017type MyStruct2 struct { 4018 x struct { 4019 int `some:"foo"` 4020 } 4021} 4022type MyString string 4023type MyBytes []byte 4024type MyBytesArrayPtr0 *[0]byte 4025type MyBytesArrayPtr *[4]byte 4026type MyBytesArray0 [0]byte 4027type MyBytesArray [4]byte 4028type MyRunes []int32 4029type MyFunc func() 4030type MyByte byte 4031 4032type IntChan chan int 4033type IntChanRecv <-chan int 4034type IntChanSend chan<- int 4035type BytesChan chan []byte 4036type BytesChanRecv <-chan []byte 4037type BytesChanSend chan<- []byte 4038 4039var convertTests = []struct { 4040 in Value 4041 out Value 4042}{ 4043 // numbers 4044 /* 4045 Edit .+1,/\*\//-1>cat >/tmp/x.go && go run /tmp/x.go 4046 4047 package main 4048 4049 import "fmt" 4050 4051 var numbers = []string{ 4052 "int8", "uint8", "int16", "uint16", 4053 "int32", "uint32", "int64", "uint64", 4054 "int", "uint", "uintptr", 4055 "float32", "float64", 4056 } 4057 4058 func main() { 4059 // all pairs but in an unusual order, 4060 // to emit all the int8, uint8 cases 4061 // before n grows too big. 4062 n := 1 4063 for i, f := range numbers { 4064 for _, g := range numbers[i:] { 4065 fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", f, n, g, n) 4066 n++ 4067 if f != g { 4068 fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", g, n, f, n) 4069 n++ 4070 } 4071 } 4072 } 4073 } 4074 */ 4075 {V(int8(1)), V(int8(1))}, 4076 {V(int8(2)), V(uint8(2))}, 4077 {V(uint8(3)), V(int8(3))}, 4078 {V(int8(4)), V(int16(4))}, 4079 {V(int16(5)), V(int8(5))}, 4080 {V(int8(6)), V(uint16(6))}, 4081 {V(uint16(7)), V(int8(7))}, 4082 {V(int8(8)), V(int32(8))}, 4083 {V(int32(9)), V(int8(9))}, 4084 {V(int8(10)), V(uint32(10))}, 4085 {V(uint32(11)), V(int8(11))}, 4086 {V(int8(12)), V(int64(12))}, 4087 {V(int64(13)), V(int8(13))}, 4088 {V(int8(14)), V(uint64(14))}, 4089 {V(uint64(15)), V(int8(15))}, 4090 {V(int8(16)), V(int(16))}, 4091 {V(int(17)), V(int8(17))}, 4092 {V(int8(18)), V(uint(18))}, 4093 {V(uint(19)), V(int8(19))}, 4094 {V(int8(20)), V(uintptr(20))}, 4095 {V(uintptr(21)), V(int8(21))}, 4096 {V(int8(22)), V(float32(22))}, 4097 {V(float32(23)), V(int8(23))}, 4098 {V(int8(24)), V(float64(24))}, 4099 {V(float64(25)), V(int8(25))}, 4100 {V(uint8(26)), V(uint8(26))}, 4101 {V(uint8(27)), V(int16(27))}, 4102 {V(int16(28)), V(uint8(28))}, 4103 {V(uint8(29)), V(uint16(29))}, 4104 {V(uint16(30)), V(uint8(30))}, 4105 {V(uint8(31)), V(int32(31))}, 4106 {V(int32(32)), V(uint8(32))}, 4107 {V(uint8(33)), V(uint32(33))}, 4108 {V(uint32(34)), V(uint8(34))}, 4109 {V(uint8(35)), V(int64(35))}, 4110 {V(int64(36)), V(uint8(36))}, 4111 {V(uint8(37)), V(uint64(37))}, 4112 {V(uint64(38)), V(uint8(38))}, 4113 {V(uint8(39)), V(int(39))}, 4114 {V(int(40)), V(uint8(40))}, 4115 {V(uint8(41)), V(uint(41))}, 4116 {V(uint(42)), V(uint8(42))}, 4117 {V(uint8(43)), V(uintptr(43))}, 4118 {V(uintptr(44)), V(uint8(44))}, 4119 {V(uint8(45)), V(float32(45))}, 4120 {V(float32(46)), V(uint8(46))}, 4121 {V(uint8(47)), V(float64(47))}, 4122 {V(float64(48)), V(uint8(48))}, 4123 {V(int16(49)), V(int16(49))}, 4124 {V(int16(50)), V(uint16(50))}, 4125 {V(uint16(51)), V(int16(51))}, 4126 {V(int16(52)), V(int32(52))}, 4127 {V(int32(53)), V(int16(53))}, 4128 {V(int16(54)), V(uint32(54))}, 4129 {V(uint32(55)), V(int16(55))}, 4130 {V(int16(56)), V(int64(56))}, 4131 {V(int64(57)), V(int16(57))}, 4132 {V(int16(58)), V(uint64(58))}, 4133 {V(uint64(59)), V(int16(59))}, 4134 {V(int16(60)), V(int(60))}, 4135 {V(int(61)), V(int16(61))}, 4136 {V(int16(62)), V(uint(62))}, 4137 {V(uint(63)), V(int16(63))}, 4138 {V(int16(64)), V(uintptr(64))}, 4139 {V(uintptr(65)), V(int16(65))}, 4140 {V(int16(66)), V(float32(66))}, 4141 {V(float32(67)), V(int16(67))}, 4142 {V(int16(68)), V(float64(68))}, 4143 {V(float64(69)), V(int16(69))}, 4144 {V(uint16(70)), V(uint16(70))}, 4145 {V(uint16(71)), V(int32(71))}, 4146 {V(int32(72)), V(uint16(72))}, 4147 {V(uint16(73)), V(uint32(73))}, 4148 {V(uint32(74)), V(uint16(74))}, 4149 {V(uint16(75)), V(int64(75))}, 4150 {V(int64(76)), V(uint16(76))}, 4151 {V(uint16(77)), V(uint64(77))}, 4152 {V(uint64(78)), V(uint16(78))}, 4153 {V(uint16(79)), V(int(79))}, 4154 {V(int(80)), V(uint16(80))}, 4155 {V(uint16(81)), V(uint(81))}, 4156 {V(uint(82)), V(uint16(82))}, 4157 {V(uint16(83)), V(uintptr(83))}, 4158 {V(uintptr(84)), V(uint16(84))}, 4159 {V(uint16(85)), V(float32(85))}, 4160 {V(float32(86)), V(uint16(86))}, 4161 {V(uint16(87)), V(float64(87))}, 4162 {V(float64(88)), V(uint16(88))}, 4163 {V(int32(89)), V(int32(89))}, 4164 {V(int32(90)), V(uint32(90))}, 4165 {V(uint32(91)), V(int32(91))}, 4166 {V(int32(92)), V(int64(92))}, 4167 {V(int64(93)), V(int32(93))}, 4168 {V(int32(94)), V(uint64(94))}, 4169 {V(uint64(95)), V(int32(95))}, 4170 {V(int32(96)), V(int(96))}, 4171 {V(int(97)), V(int32(97))}, 4172 {V(int32(98)), V(uint(98))}, 4173 {V(uint(99)), V(int32(99))}, 4174 {V(int32(100)), V(uintptr(100))}, 4175 {V(uintptr(101)), V(int32(101))}, 4176 {V(int32(102)), V(float32(102))}, 4177 {V(float32(103)), V(int32(103))}, 4178 {V(int32(104)), V(float64(104))}, 4179 {V(float64(105)), V(int32(105))}, 4180 {V(uint32(106)), V(uint32(106))}, 4181 {V(uint32(107)), V(int64(107))}, 4182 {V(int64(108)), V(uint32(108))}, 4183 {V(uint32(109)), V(uint64(109))}, 4184 {V(uint64(110)), V(uint32(110))}, 4185 {V(uint32(111)), V(int(111))}, 4186 {V(int(112)), V(uint32(112))}, 4187 {V(uint32(113)), V(uint(113))}, 4188 {V(uint(114)), V(uint32(114))}, 4189 {V(uint32(115)), V(uintptr(115))}, 4190 {V(uintptr(116)), V(uint32(116))}, 4191 {V(uint32(117)), V(float32(117))}, 4192 {V(float32(118)), V(uint32(118))}, 4193 {V(uint32(119)), V(float64(119))}, 4194 {V(float64(120)), V(uint32(120))}, 4195 {V(int64(121)), V(int64(121))}, 4196 {V(int64(122)), V(uint64(122))}, 4197 {V(uint64(123)), V(int64(123))}, 4198 {V(int64(124)), V(int(124))}, 4199 {V(int(125)), V(int64(125))}, 4200 {V(int64(126)), V(uint(126))}, 4201 {V(uint(127)), V(int64(127))}, 4202 {V(int64(128)), V(uintptr(128))}, 4203 {V(uintptr(129)), V(int64(129))}, 4204 {V(int64(130)), V(float32(130))}, 4205 {V(float32(131)), V(int64(131))}, 4206 {V(int64(132)), V(float64(132))}, 4207 {V(float64(133)), V(int64(133))}, 4208 {V(uint64(134)), V(uint64(134))}, 4209 {V(uint64(135)), V(int(135))}, 4210 {V(int(136)), V(uint64(136))}, 4211 {V(uint64(137)), V(uint(137))}, 4212 {V(uint(138)), V(uint64(138))}, 4213 {V(uint64(139)), V(uintptr(139))}, 4214 {V(uintptr(140)), V(uint64(140))}, 4215 {V(uint64(141)), V(float32(141))}, 4216 {V(float32(142)), V(uint64(142))}, 4217 {V(uint64(143)), V(float64(143))}, 4218 {V(float64(144)), V(uint64(144))}, 4219 {V(int(145)), V(int(145))}, 4220 {V(int(146)), V(uint(146))}, 4221 {V(uint(147)), V(int(147))}, 4222 {V(int(148)), V(uintptr(148))}, 4223 {V(uintptr(149)), V(int(149))}, 4224 {V(int(150)), V(float32(150))}, 4225 {V(float32(151)), V(int(151))}, 4226 {V(int(152)), V(float64(152))}, 4227 {V(float64(153)), V(int(153))}, 4228 {V(uint(154)), V(uint(154))}, 4229 {V(uint(155)), V(uintptr(155))}, 4230 {V(uintptr(156)), V(uint(156))}, 4231 {V(uint(157)), V(float32(157))}, 4232 {V(float32(158)), V(uint(158))}, 4233 {V(uint(159)), V(float64(159))}, 4234 {V(float64(160)), V(uint(160))}, 4235 {V(uintptr(161)), V(uintptr(161))}, 4236 {V(uintptr(162)), V(float32(162))}, 4237 {V(float32(163)), V(uintptr(163))}, 4238 {V(uintptr(164)), V(float64(164))}, 4239 {V(float64(165)), V(uintptr(165))}, 4240 {V(float32(166)), V(float32(166))}, 4241 {V(float32(167)), V(float64(167))}, 4242 {V(float64(168)), V(float32(168))}, 4243 {V(float64(169)), V(float64(169))}, 4244 4245 // truncation 4246 {V(float64(1.5)), V(int(1))}, 4247 4248 // complex 4249 {V(complex64(1i)), V(complex64(1i))}, 4250 {V(complex64(2i)), V(complex128(2i))}, 4251 {V(complex128(3i)), V(complex64(3i))}, 4252 {V(complex128(4i)), V(complex128(4i))}, 4253 4254 // string 4255 {V(string("hello")), V(string("hello"))}, 4256 {V(string("bytes1")), V([]byte("bytes1"))}, 4257 {V([]byte("bytes2")), V(string("bytes2"))}, 4258 {V([]byte("bytes3")), V([]byte("bytes3"))}, 4259 {V(string("runes♝")), V([]rune("runes♝"))}, 4260 {V([]rune("runes♕")), V(string("runes♕"))}, 4261 {V([]rune("runes")), V([]rune("runes"))}, 4262 {V(int('a')), V(string("a"))}, 4263 {V(int8('a')), V(string("a"))}, 4264 {V(int16('a')), V(string("a"))}, 4265 {V(int32('a')), V(string("a"))}, 4266 {V(int64('a')), V(string("a"))}, 4267 {V(uint('a')), V(string("a"))}, 4268 {V(uint8('a')), V(string("a"))}, 4269 {V(uint16('a')), V(string("a"))}, 4270 {V(uint32('a')), V(string("a"))}, 4271 {V(uint64('a')), V(string("a"))}, 4272 {V(uintptr('a')), V(string("a"))}, 4273 {V(int(-1)), V(string("\uFFFD"))}, 4274 {V(int8(-2)), V(string("\uFFFD"))}, 4275 {V(int16(-3)), V(string("\uFFFD"))}, 4276 {V(int32(-4)), V(string("\uFFFD"))}, 4277 {V(int64(-5)), V(string("\uFFFD"))}, 4278 {V(int64(-1 << 32)), V(string("\uFFFD"))}, 4279 {V(int64(1 << 32)), V(string("\uFFFD"))}, 4280 {V(uint(0x110001)), V(string("\uFFFD"))}, 4281 {V(uint32(0x110002)), V(string("\uFFFD"))}, 4282 {V(uint64(0x110003)), V(string("\uFFFD"))}, 4283 {V(uint64(1 << 32)), V(string("\uFFFD"))}, 4284 {V(uintptr(0x110004)), V(string("\uFFFD"))}, 4285 4286 // named string 4287 {V(MyString("hello")), V(string("hello"))}, 4288 {V(string("hello")), V(MyString("hello"))}, 4289 {V(string("hello")), V(string("hello"))}, 4290 {V(MyString("hello")), V(MyString("hello"))}, 4291 {V(MyString("bytes1")), V([]byte("bytes1"))}, 4292 {V([]byte("bytes2")), V(MyString("bytes2"))}, 4293 {V([]byte("bytes3")), V([]byte("bytes3"))}, 4294 {V(MyString("runes♝")), V([]rune("runes♝"))}, 4295 {V([]rune("runes♕")), V(MyString("runes♕"))}, 4296 {V([]rune("runes")), V([]rune("runes"))}, 4297 {V([]rune("runes")), V(MyRunes("runes"))}, 4298 {V(MyRunes("runes")), V([]rune("runes"))}, 4299 {V(int('a')), V(MyString("a"))}, 4300 {V(int8('a')), V(MyString("a"))}, 4301 {V(int16('a')), V(MyString("a"))}, 4302 {V(int32('a')), V(MyString("a"))}, 4303 {V(int64('a')), V(MyString("a"))}, 4304 {V(uint('a')), V(MyString("a"))}, 4305 {V(uint8('a')), V(MyString("a"))}, 4306 {V(uint16('a')), V(MyString("a"))}, 4307 {V(uint32('a')), V(MyString("a"))}, 4308 {V(uint64('a')), V(MyString("a"))}, 4309 {V(uintptr('a')), V(MyString("a"))}, 4310 {V(int(-1)), V(MyString("\uFFFD"))}, 4311 {V(int8(-2)), V(MyString("\uFFFD"))}, 4312 {V(int16(-3)), V(MyString("\uFFFD"))}, 4313 {V(int32(-4)), V(MyString("\uFFFD"))}, 4314 {V(int64(-5)), V(MyString("\uFFFD"))}, 4315 {V(uint(0x110001)), V(MyString("\uFFFD"))}, 4316 {V(uint32(0x110002)), V(MyString("\uFFFD"))}, 4317 {V(uint64(0x110003)), V(MyString("\uFFFD"))}, 4318 {V(uintptr(0x110004)), V(MyString("\uFFFD"))}, 4319 4320 // named []byte 4321 {V(string("bytes1")), V(MyBytes("bytes1"))}, 4322 {V(MyBytes("bytes2")), V(string("bytes2"))}, 4323 {V(MyBytes("bytes3")), V(MyBytes("bytes3"))}, 4324 {V(MyString("bytes1")), V(MyBytes("bytes1"))}, 4325 {V(MyBytes("bytes2")), V(MyString("bytes2"))}, 4326 4327 // named []rune 4328 {V(string("runes♝")), V(MyRunes("runes♝"))}, 4329 {V(MyRunes("runes♕")), V(string("runes♕"))}, 4330 {V(MyRunes("runes")), V(MyRunes("runes"))}, 4331 {V(MyString("runes♝")), V(MyRunes("runes♝"))}, 4332 {V(MyRunes("runes♕")), V(MyString("runes♕"))}, 4333 4334 // slice to array pointer 4335 {V([]byte(nil)), V((*[0]byte)(nil))}, 4336 {V([]byte{}), V(new([0]byte))}, 4337 {V([]byte{7}), V(&[1]byte{7})}, 4338 {V(MyBytes([]byte(nil))), V((*[0]byte)(nil))}, 4339 {V(MyBytes([]byte{})), V(new([0]byte))}, 4340 {V(MyBytes([]byte{9})), V(&[1]byte{9})}, 4341 {V([]byte(nil)), V(MyBytesArrayPtr0(nil))}, 4342 {V([]byte{}), V(MyBytesArrayPtr0(new([0]byte)))}, 4343 {V([]byte{1, 2, 3, 4}), V(MyBytesArrayPtr(&[4]byte{1, 2, 3, 4}))}, 4344 {V(MyBytes([]byte{})), V(MyBytesArrayPtr0(new([0]byte)))}, 4345 {V(MyBytes([]byte{5, 6, 7, 8})), V(MyBytesArrayPtr(&[4]byte{5, 6, 7, 8}))}, 4346 4347 {V([]byte(nil)), V((*MyBytesArray0)(nil))}, 4348 {V([]byte{}), V((*MyBytesArray0)(new([0]byte)))}, 4349 {V([]byte{1, 2, 3, 4}), V(&MyBytesArray{1, 2, 3, 4})}, 4350 {V(MyBytes([]byte(nil))), V((*MyBytesArray0)(nil))}, 4351 {V(MyBytes([]byte{})), V((*MyBytesArray0)(new([0]byte)))}, 4352 {V(MyBytes([]byte{5, 6, 7, 8})), V(&MyBytesArray{5, 6, 7, 8})}, 4353 {V(new([0]byte)), V(new(MyBytesArray0))}, 4354 {V(new(MyBytesArray0)), V(new([0]byte))}, 4355 {V(MyBytesArrayPtr0(nil)), V((*[0]byte)(nil))}, 4356 {V((*[0]byte)(nil)), V(MyBytesArrayPtr0(nil))}, 4357 4358 // named types and equal underlying types 4359 {V(new(int)), V(new(integer))}, 4360 {V(new(integer)), V(new(int))}, 4361 {V(Empty{}), V(struct{}{})}, 4362 {V(new(Empty)), V(new(struct{}))}, 4363 {V(struct{}{}), V(Empty{})}, 4364 {V(new(struct{})), V(new(Empty))}, 4365 {V(Empty{}), V(Empty{})}, 4366 {V(MyBytes{}), V([]byte{})}, 4367 {V([]byte{}), V(MyBytes{})}, 4368 {V((func())(nil)), V(MyFunc(nil))}, 4369 {V((MyFunc)(nil)), V((func())(nil))}, 4370 4371 // structs with different tags 4372 {V(struct { 4373 x int `some:"foo"` 4374 }{}), V(struct { 4375 x int `some:"bar"` 4376 }{})}, 4377 4378 {V(struct { 4379 x int `some:"bar"` 4380 }{}), V(struct { 4381 x int `some:"foo"` 4382 }{})}, 4383 4384 {V(MyStruct{}), V(struct { 4385 x int `some:"foo"` 4386 }{})}, 4387 4388 {V(struct { 4389 x int `some:"foo"` 4390 }{}), V(MyStruct{})}, 4391 4392 {V(MyStruct{}), V(struct { 4393 x int `some:"bar"` 4394 }{})}, 4395 4396 {V(struct { 4397 x int `some:"bar"` 4398 }{}), V(MyStruct{})}, 4399 4400 {V(MyStruct1{}), V(MyStruct2{})}, 4401 {V(MyStruct2{}), V(MyStruct1{})}, 4402 4403 // can convert *byte and *MyByte 4404 {V((*byte)(nil)), V((*MyByte)(nil))}, 4405 {V((*MyByte)(nil)), V((*byte)(nil))}, 4406 4407 // cannot convert mismatched array sizes 4408 {V([2]byte{}), V([2]byte{})}, 4409 {V([3]byte{}), V([3]byte{})}, 4410 4411 // cannot convert other instances 4412 {V((**byte)(nil)), V((**byte)(nil))}, 4413 {V((**MyByte)(nil)), V((**MyByte)(nil))}, 4414 {V((chan byte)(nil)), V((chan byte)(nil))}, 4415 {V((chan MyByte)(nil)), V((chan MyByte)(nil))}, 4416 {V(([]byte)(nil)), V(([]byte)(nil))}, 4417 {V(([]MyByte)(nil)), V(([]MyByte)(nil))}, 4418 {V((map[int]byte)(nil)), V((map[int]byte)(nil))}, 4419 {V((map[int]MyByte)(nil)), V((map[int]MyByte)(nil))}, 4420 {V((map[byte]int)(nil)), V((map[byte]int)(nil))}, 4421 {V((map[MyByte]int)(nil)), V((map[MyByte]int)(nil))}, 4422 {V([2]byte{}), V([2]byte{})}, 4423 {V([2]MyByte{}), V([2]MyByte{})}, 4424 4425 // other 4426 {V((***int)(nil)), V((***int)(nil))}, 4427 {V((***byte)(nil)), V((***byte)(nil))}, 4428 {V((***int32)(nil)), V((***int32)(nil))}, 4429 {V((***int64)(nil)), V((***int64)(nil))}, 4430 {V((chan byte)(nil)), V((chan byte)(nil))}, 4431 {V((chan MyByte)(nil)), V((chan MyByte)(nil))}, 4432 {V((map[int]bool)(nil)), V((map[int]bool)(nil))}, 4433 {V((map[int]byte)(nil)), V((map[int]byte)(nil))}, 4434 {V((map[uint]bool)(nil)), V((map[uint]bool)(nil))}, 4435 {V([]uint(nil)), V([]uint(nil))}, 4436 {V([]int(nil)), V([]int(nil))}, 4437 {V(new(any)), V(new(any))}, 4438 {V(new(io.Reader)), V(new(io.Reader))}, 4439 {V(new(io.Writer)), V(new(io.Writer))}, 4440 4441 // channels 4442 {V(IntChan(nil)), V((chan<- int)(nil))}, 4443 {V(IntChan(nil)), V((<-chan int)(nil))}, 4444 {V((chan int)(nil)), V(IntChanRecv(nil))}, 4445 {V((chan int)(nil)), V(IntChanSend(nil))}, 4446 {V(IntChanRecv(nil)), V((<-chan int)(nil))}, 4447 {V((<-chan int)(nil)), V(IntChanRecv(nil))}, 4448 {V(IntChanSend(nil)), V((chan<- int)(nil))}, 4449 {V((chan<- int)(nil)), V(IntChanSend(nil))}, 4450 {V(IntChan(nil)), V((chan int)(nil))}, 4451 {V((chan int)(nil)), V(IntChan(nil))}, 4452 {V((chan int)(nil)), V((<-chan int)(nil))}, 4453 {V((chan int)(nil)), V((chan<- int)(nil))}, 4454 {V(BytesChan(nil)), V((chan<- []byte)(nil))}, 4455 {V(BytesChan(nil)), V((<-chan []byte)(nil))}, 4456 {V((chan []byte)(nil)), V(BytesChanRecv(nil))}, 4457 {V((chan []byte)(nil)), V(BytesChanSend(nil))}, 4458 {V(BytesChanRecv(nil)), V((<-chan []byte)(nil))}, 4459 {V((<-chan []byte)(nil)), V(BytesChanRecv(nil))}, 4460 {V(BytesChanSend(nil)), V((chan<- []byte)(nil))}, 4461 {V((chan<- []byte)(nil)), V(BytesChanSend(nil))}, 4462 {V(BytesChan(nil)), V((chan []byte)(nil))}, 4463 {V((chan []byte)(nil)), V(BytesChan(nil))}, 4464 {V((chan []byte)(nil)), V((<-chan []byte)(nil))}, 4465 {V((chan []byte)(nil)), V((chan<- []byte)(nil))}, 4466 4467 // cannot convert other instances (channels) 4468 {V(IntChan(nil)), V(IntChan(nil))}, 4469 {V(IntChanRecv(nil)), V(IntChanRecv(nil))}, 4470 {V(IntChanSend(nil)), V(IntChanSend(nil))}, 4471 {V(BytesChan(nil)), V(BytesChan(nil))}, 4472 {V(BytesChanRecv(nil)), V(BytesChanRecv(nil))}, 4473 {V(BytesChanSend(nil)), V(BytesChanSend(nil))}, 4474 4475 // interfaces 4476 {V(int(1)), EmptyInterfaceV(int(1))}, 4477 {V(string("hello")), EmptyInterfaceV(string("hello"))}, 4478 {V(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))}, 4479 {ReadWriterV(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))}, 4480 {V(new(bytes.Buffer)), ReadWriterV(new(bytes.Buffer))}, 4481} 4482 4483func TestConvert(t *testing.T) { 4484 canConvert := map[[2]Type]bool{} 4485 all := map[Type]bool{} 4486 4487 for _, tt := range convertTests { 4488 t1 := tt.in.Type() 4489 if !t1.ConvertibleTo(t1) { 4490 t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t1) 4491 continue 4492 } 4493 4494 t2 := tt.out.Type() 4495 if !t1.ConvertibleTo(t2) { 4496 t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t2) 4497 continue 4498 } 4499 4500 all[t1] = true 4501 all[t2] = true 4502 canConvert[[2]Type{t1, t2}] = true 4503 4504 // vout1 represents the in value converted to the in type. 4505 v1 := tt.in 4506 if !v1.CanConvert(t1) { 4507 t.Errorf("ValueOf(%T(%[1]v)).CanConvert(%s) = false, want true", tt.in.Interface(), t1) 4508 } 4509 vout1 := v1.Convert(t1) 4510 out1 := vout1.Interface() 4511 if vout1.Type() != tt.in.Type() || !DeepEqual(out1, tt.in.Interface()) { 4512 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t1, out1, tt.in.Interface()) 4513 } 4514 4515 // vout2 represents the in value converted to the out type. 4516 if !v1.CanConvert(t2) { 4517 t.Errorf("ValueOf(%T(%[1]v)).CanConvert(%s) = false, want true", tt.in.Interface(), t2) 4518 } 4519 vout2 := v1.Convert(t2) 4520 out2 := vout2.Interface() 4521 if vout2.Type() != tt.out.Type() || !DeepEqual(out2, tt.out.Interface()) { 4522 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out2, tt.out.Interface()) 4523 } 4524 if got, want := vout2.Kind(), vout2.Type().Kind(); got != want { 4525 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) has internal kind %v want %v", tt.in.Interface(), t1, got, want) 4526 } 4527 4528 // vout3 represents a new value of the out type, set to vout2. This makes 4529 // sure the converted value vout2 is really usable as a regular value. 4530 vout3 := New(t2).Elem() 4531 vout3.Set(vout2) 4532 out3 := vout3.Interface() 4533 if vout3.Type() != tt.out.Type() || !DeepEqual(out3, tt.out.Interface()) { 4534 t.Errorf("Set(ValueOf(%T(%[1]v)).Convert(%s)) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out3, tt.out.Interface()) 4535 } 4536 4537 if IsRO(v1) { 4538 t.Errorf("table entry %v is RO, should not be", v1) 4539 } 4540 if IsRO(vout1) { 4541 t.Errorf("self-conversion output %v is RO, should not be", vout1) 4542 } 4543 if IsRO(vout2) { 4544 t.Errorf("conversion output %v is RO, should not be", vout2) 4545 } 4546 if IsRO(vout3) { 4547 t.Errorf("set(conversion output) %v is RO, should not be", vout3) 4548 } 4549 if !IsRO(MakeRO(v1).Convert(t1)) { 4550 t.Errorf("RO self-conversion output %v is not RO, should be", v1) 4551 } 4552 if !IsRO(MakeRO(v1).Convert(t2)) { 4553 t.Errorf("RO conversion output %v is not RO, should be", v1) 4554 } 4555 } 4556 4557 // Assume that of all the types we saw during the tests, 4558 // if there wasn't an explicit entry for a conversion between 4559 // a pair of types, then it's not to be allowed. This checks for 4560 // things like 'int64' converting to '*int'. 4561 for t1 := range all { 4562 for t2 := range all { 4563 expectOK := t1 == t2 || canConvert[[2]Type{t1, t2}] || t2.Kind() == Interface && t2.NumMethod() == 0 4564 if ok := t1.ConvertibleTo(t2); ok != expectOK { 4565 t.Errorf("(%s).ConvertibleTo(%s) = %v, want %v", t1, t2, ok, expectOK) 4566 } 4567 } 4568 } 4569} 4570 4571func TestConvertPanic(t *testing.T) { 4572 s := make([]byte, 4) 4573 p := new([8]byte) 4574 v := ValueOf(s) 4575 pt := TypeOf(p) 4576 if !v.Type().ConvertibleTo(pt) { 4577 t.Errorf("[]byte should be convertible to *[8]byte") 4578 } 4579 if v.CanConvert(pt) { 4580 t.Errorf("slice with length 4 should not be convertible to *[8]byte") 4581 } 4582 shouldPanic("reflect: cannot convert slice with length 4 to pointer to array with length 8", func() { 4583 _ = v.Convert(pt) 4584 }) 4585} 4586 4587var gFloat32 float32 4588 4589const snan uint32 = 0x7f800001 4590 4591func TestConvertNaNs(t *testing.T) { 4592 // Test to see if a store followed by a load of a signaling NaN 4593 // maintains the signaling bit. (This used to fail on the 387 port.) 4594 gFloat32 = math.Float32frombits(snan) 4595 runtime.Gosched() // make sure we don't optimize the store/load away 4596 if got := math.Float32bits(gFloat32); got != snan { 4597 t.Errorf("store/load of sNaN not faithful, got %x want %x", got, snan) 4598 } 4599 // Test reflect's conversion between float32s. See issue 36400. 4600 type myFloat32 float32 4601 x := V(myFloat32(math.Float32frombits(snan))) 4602 y := x.Convert(TypeOf(float32(0))) 4603 z := y.Interface().(float32) 4604 if got := math.Float32bits(z); got != snan { 4605 t.Errorf("signaling nan conversion got %x, want %x", got, snan) 4606 } 4607} 4608 4609type ComparableStruct struct { 4610 X int 4611} 4612 4613type NonComparableStruct struct { 4614 X int 4615 Y map[string]int 4616} 4617 4618var comparableTests = []struct { 4619 typ Type 4620 ok bool 4621}{ 4622 {TypeOf(1), true}, 4623 {TypeOf("hello"), true}, 4624 {TypeOf(new(byte)), true}, 4625 {TypeOf((func())(nil)), false}, 4626 {TypeOf([]byte{}), false}, 4627 {TypeOf(map[string]int{}), false}, 4628 {TypeOf(make(chan int)), true}, 4629 {TypeOf(1.5), true}, 4630 {TypeOf(false), true}, 4631 {TypeOf(1i), true}, 4632 {TypeOf(ComparableStruct{}), true}, 4633 {TypeOf(NonComparableStruct{}), false}, 4634 {TypeOf([10]map[string]int{}), false}, 4635 {TypeOf([10]string{}), true}, 4636 {TypeOf(new(any)).Elem(), true}, 4637} 4638 4639func TestComparable(t *testing.T) { 4640 for _, tt := range comparableTests { 4641 if ok := tt.typ.Comparable(); ok != tt.ok { 4642 t.Errorf("TypeOf(%v).Comparable() = %v, want %v", tt.typ, ok, tt.ok) 4643 } 4644 } 4645} 4646 4647func TestOverflow(t *testing.T) { 4648 if ovf := V(float64(0)).OverflowFloat(1e300); ovf { 4649 t.Errorf("%v wrongly overflows float64", 1e300) 4650 } 4651 4652 maxFloat32 := float64((1<<24 - 1) << (127 - 23)) 4653 if ovf := V(float32(0)).OverflowFloat(maxFloat32); ovf { 4654 t.Errorf("%v wrongly overflows float32", maxFloat32) 4655 } 4656 ovfFloat32 := float64((1<<24-1)<<(127-23) + 1<<(127-52)) 4657 if ovf := V(float32(0)).OverflowFloat(ovfFloat32); !ovf { 4658 t.Errorf("%v should overflow float32", ovfFloat32) 4659 } 4660 if ovf := V(float32(0)).OverflowFloat(-ovfFloat32); !ovf { 4661 t.Errorf("%v should overflow float32", -ovfFloat32) 4662 } 4663 4664 maxInt32 := int64(0x7fffffff) 4665 if ovf := V(int32(0)).OverflowInt(maxInt32); ovf { 4666 t.Errorf("%v wrongly overflows int32", maxInt32) 4667 } 4668 if ovf := V(int32(0)).OverflowInt(-1 << 31); ovf { 4669 t.Errorf("%v wrongly overflows int32", -int64(1)<<31) 4670 } 4671 ovfInt32 := int64(1 << 31) 4672 if ovf := V(int32(0)).OverflowInt(ovfInt32); !ovf { 4673 t.Errorf("%v should overflow int32", ovfInt32) 4674 } 4675 4676 maxUint32 := uint64(0xffffffff) 4677 if ovf := V(uint32(0)).OverflowUint(maxUint32); ovf { 4678 t.Errorf("%v wrongly overflows uint32", maxUint32) 4679 } 4680 ovfUint32 := uint64(1 << 32) 4681 if ovf := V(uint32(0)).OverflowUint(ovfUint32); !ovf { 4682 t.Errorf("%v should overflow uint32", ovfUint32) 4683 } 4684} 4685 4686func checkSameType(t *testing.T, x Type, y any) { 4687 if x != TypeOf(y) || TypeOf(Zero(x).Interface()) != TypeOf(y) { 4688 t.Errorf("did not find preexisting type for %s (vs %s)", TypeOf(x), TypeOf(y)) 4689 } 4690} 4691 4692func TestArrayOf(t *testing.T) { 4693 // check construction and use of type not in binary 4694 tests := []struct { 4695 n int 4696 value func(i int) any 4697 comparable bool 4698 want string 4699 }{ 4700 { 4701 n: 0, 4702 value: func(i int) any { type Tint int; return Tint(i) }, 4703 comparable: true, 4704 want: "[]", 4705 }, 4706 { 4707 n: 10, 4708 value: func(i int) any { type Tint int; return Tint(i) }, 4709 comparable: true, 4710 want: "[0 1 2 3 4 5 6 7 8 9]", 4711 }, 4712 { 4713 n: 10, 4714 value: func(i int) any { type Tfloat float64; return Tfloat(i) }, 4715 comparable: true, 4716 want: "[0 1 2 3 4 5 6 7 8 9]", 4717 }, 4718 { 4719 n: 10, 4720 value: func(i int) any { type Tstring string; return Tstring(strconv.Itoa(i)) }, 4721 comparable: true, 4722 want: "[0 1 2 3 4 5 6 7 8 9]", 4723 }, 4724 { 4725 n: 10, 4726 value: func(i int) any { type Tstruct struct{ V int }; return Tstruct{i} }, 4727 comparable: true, 4728 want: "[{0} {1} {2} {3} {4} {5} {6} {7} {8} {9}]", 4729 }, 4730 { 4731 n: 10, 4732 value: func(i int) any { type Tint int; return []Tint{Tint(i)} }, 4733 comparable: false, 4734 want: "[[0] [1] [2] [3] [4] [5] [6] [7] [8] [9]]", 4735 }, 4736 { 4737 n: 10, 4738 value: func(i int) any { type Tint int; return [1]Tint{Tint(i)} }, 4739 comparable: true, 4740 want: "[[0] [1] [2] [3] [4] [5] [6] [7] [8] [9]]", 4741 }, 4742 { 4743 n: 10, 4744 value: func(i int) any { type Tstruct struct{ V [1]int }; return Tstruct{[1]int{i}} }, 4745 comparable: true, 4746 want: "[{[0]} {[1]} {[2]} {[3]} {[4]} {[5]} {[6]} {[7]} {[8]} {[9]}]", 4747 }, 4748 { 4749 n: 10, 4750 value: func(i int) any { type Tstruct struct{ V []int }; return Tstruct{[]int{i}} }, 4751 comparable: false, 4752 want: "[{[0]} {[1]} {[2]} {[3]} {[4]} {[5]} {[6]} {[7]} {[8]} {[9]}]", 4753 }, 4754 { 4755 n: 10, 4756 value: func(i int) any { type TstructUV struct{ U, V int }; return TstructUV{i, i} }, 4757 comparable: true, 4758 want: "[{0 0} {1 1} {2 2} {3 3} {4 4} {5 5} {6 6} {7 7} {8 8} {9 9}]", 4759 }, 4760 { 4761 n: 10, 4762 value: func(i int) any { 4763 type TstructUV struct { 4764 U int 4765 V float64 4766 } 4767 return TstructUV{i, float64(i)} 4768 }, 4769 comparable: true, 4770 want: "[{0 0} {1 1} {2 2} {3 3} {4 4} {5 5} {6 6} {7 7} {8 8} {9 9}]", 4771 }, 4772 } 4773 4774 for _, table := range tests { 4775 at := ArrayOf(table.n, TypeOf(table.value(0))) 4776 v := New(at).Elem() 4777 vok := New(at).Elem() 4778 vnot := New(at).Elem() 4779 for i := 0; i < v.Len(); i++ { 4780 v.Index(i).Set(ValueOf(table.value(i))) 4781 vok.Index(i).Set(ValueOf(table.value(i))) 4782 j := i 4783 if i+1 == v.Len() { 4784 j = i + 1 4785 } 4786 vnot.Index(i).Set(ValueOf(table.value(j))) // make it differ only by last element 4787 } 4788 s := fmt.Sprint(v.Interface()) 4789 if s != table.want { 4790 t.Errorf("constructed array = %s, want %s", s, table.want) 4791 } 4792 4793 if table.comparable != at.Comparable() { 4794 t.Errorf("constructed array (%#v) is comparable=%v, want=%v", v.Interface(), at.Comparable(), table.comparable) 4795 } 4796 if table.comparable { 4797 if table.n > 0 { 4798 if DeepEqual(vnot.Interface(), v.Interface()) { 4799 t.Errorf( 4800 "arrays (%#v) compare ok (but should not)", 4801 v.Interface(), 4802 ) 4803 } 4804 } 4805 if !DeepEqual(vok.Interface(), v.Interface()) { 4806 t.Errorf( 4807 "arrays (%#v) compare NOT-ok (but should)", 4808 v.Interface(), 4809 ) 4810 } 4811 } 4812 } 4813 4814 // check that type already in binary is found 4815 type T int 4816 checkSameType(t, ArrayOf(5, TypeOf(T(1))), [5]T{}) 4817} 4818 4819func TestArrayOfGC(t *testing.T) { 4820 type T *uintptr 4821 tt := TypeOf(T(nil)) 4822 const n = 100 4823 var x []any 4824 for i := 0; i < n; i++ { 4825 v := New(ArrayOf(n, tt)).Elem() 4826 for j := 0; j < v.Len(); j++ { 4827 p := new(uintptr) 4828 *p = uintptr(i*n + j) 4829 v.Index(j).Set(ValueOf(p).Convert(tt)) 4830 } 4831 x = append(x, v.Interface()) 4832 } 4833 runtime.GC() 4834 4835 for i, xi := range x { 4836 v := ValueOf(xi) 4837 for j := 0; j < v.Len(); j++ { 4838 k := v.Index(j).Elem().Interface() 4839 if k != uintptr(i*n+j) { 4840 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 4841 } 4842 } 4843 } 4844} 4845 4846func TestArrayOfAlg(t *testing.T) { 4847 at := ArrayOf(6, TypeOf(byte(0))) 4848 v1 := New(at).Elem() 4849 v2 := New(at).Elem() 4850 if v1.Interface() != v1.Interface() { 4851 t.Errorf("constructed array %v not equal to itself", v1.Interface()) 4852 } 4853 v1.Index(5).Set(ValueOf(byte(1))) 4854 if i1, i2 := v1.Interface(), v2.Interface(); i1 == i2 { 4855 t.Errorf("constructed arrays %v and %v should not be equal", i1, i2) 4856 } 4857 4858 at = ArrayOf(6, TypeOf([]int(nil))) 4859 v1 = New(at).Elem() 4860 shouldPanic("", func() { _ = v1.Interface() == v1.Interface() }) 4861} 4862 4863func TestArrayOfGenericAlg(t *testing.T) { 4864 at1 := ArrayOf(5, TypeOf(string(""))) 4865 at := ArrayOf(6, at1) 4866 v1 := New(at).Elem() 4867 v2 := New(at).Elem() 4868 if v1.Interface() != v1.Interface() { 4869 t.Errorf("constructed array %v not equal to itself", v1.Interface()) 4870 } 4871 4872 v1.Index(0).Index(0).Set(ValueOf("abc")) 4873 v2.Index(0).Index(0).Set(ValueOf("efg")) 4874 if i1, i2 := v1.Interface(), v2.Interface(); i1 == i2 { 4875 t.Errorf("constructed arrays %v and %v should not be equal", i1, i2) 4876 } 4877 4878 v1.Index(0).Index(0).Set(ValueOf("abc")) 4879 v2.Index(0).Index(0).Set(ValueOf((v1.Index(0).Index(0).String() + " ")[:3])) 4880 if i1, i2 := v1.Interface(), v2.Interface(); i1 != i2 { 4881 t.Errorf("constructed arrays %v and %v should be equal", i1, i2) 4882 } 4883 4884 // Test hash 4885 m := MakeMap(MapOf(at, TypeOf(int(0)))) 4886 m.SetMapIndex(v1, ValueOf(1)) 4887 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() { 4888 t.Errorf("constructed arrays %v and %v have different hashes", i1, i2) 4889 } 4890} 4891 4892func TestArrayOfDirectIface(t *testing.T) { 4893 { 4894 type T [1]*byte 4895 i1 := Zero(TypeOf(T{})).Interface() 4896 v1 := ValueOf(&i1).Elem() 4897 p1 := v1.InterfaceData()[1] 4898 4899 i2 := Zero(ArrayOf(1, PointerTo(TypeOf(int8(0))))).Interface() 4900 v2 := ValueOf(&i2).Elem() 4901 p2 := v2.InterfaceData()[1] 4902 4903 if p1 != 0 { 4904 t.Errorf("got p1=%v. want=%v", p1, nil) 4905 } 4906 4907 if p2 != 0 { 4908 t.Errorf("got p2=%v. want=%v", p2, nil) 4909 } 4910 } 4911 { 4912 type T [0]*byte 4913 i1 := Zero(TypeOf(T{})).Interface() 4914 v1 := ValueOf(&i1).Elem() 4915 p1 := v1.InterfaceData()[1] 4916 4917 i2 := Zero(ArrayOf(0, PointerTo(TypeOf(int8(0))))).Interface() 4918 v2 := ValueOf(&i2).Elem() 4919 p2 := v2.InterfaceData()[1] 4920 4921 if p1 == 0 { 4922 t.Errorf("got p1=%v. want=not-%v", p1, nil) 4923 } 4924 4925 if p2 == 0 { 4926 t.Errorf("got p2=%v. want=not-%v", p2, nil) 4927 } 4928 } 4929} 4930 4931// Ensure passing in negative lengths panics. 4932// See https://golang.org/issue/43603 4933func TestArrayOfPanicOnNegativeLength(t *testing.T) { 4934 shouldPanic("reflect: negative length passed to ArrayOf", func() { 4935 ArrayOf(-1, TypeOf(byte(0))) 4936 }) 4937} 4938 4939func TestSliceOf(t *testing.T) { 4940 // check construction and use of type not in binary 4941 type T int 4942 st := SliceOf(TypeOf(T(1))) 4943 if got, want := st.String(), "[]reflect_test.T"; got != want { 4944 t.Errorf("SliceOf(T(1)).String()=%q, want %q", got, want) 4945 } 4946 v := MakeSlice(st, 10, 10) 4947 runtime.GC() 4948 for i := 0; i < v.Len(); i++ { 4949 v.Index(i).Set(ValueOf(T(i))) 4950 runtime.GC() 4951 } 4952 s := fmt.Sprint(v.Interface()) 4953 want := "[0 1 2 3 4 5 6 7 8 9]" 4954 if s != want { 4955 t.Errorf("constructed slice = %s, want %s", s, want) 4956 } 4957 4958 // check that type already in binary is found 4959 type T1 int 4960 checkSameType(t, SliceOf(TypeOf(T1(1))), []T1{}) 4961} 4962 4963func TestSliceOverflow(t *testing.T) { 4964 // check that MakeSlice panics when size of slice overflows uint 4965 const S = 1e6 4966 s := uint(S) 4967 l := (1<<(unsafe.Sizeof((*byte)(nil))*8)-1)/s + 1 4968 if l*s >= s { 4969 t.Fatal("slice size does not overflow") 4970 } 4971 var x [S]byte 4972 st := SliceOf(TypeOf(x)) 4973 defer func() { 4974 err := recover() 4975 if err == nil { 4976 t.Fatal("slice overflow does not panic") 4977 } 4978 }() 4979 MakeSlice(st, int(l), int(l)) 4980} 4981 4982func TestSliceOfGC(t *testing.T) { 4983 type T *uintptr 4984 tt := TypeOf(T(nil)) 4985 st := SliceOf(tt) 4986 const n = 100 4987 var x []any 4988 for i := 0; i < n; i++ { 4989 v := MakeSlice(st, n, n) 4990 for j := 0; j < v.Len(); j++ { 4991 p := new(uintptr) 4992 *p = uintptr(i*n + j) 4993 v.Index(j).Set(ValueOf(p).Convert(tt)) 4994 } 4995 x = append(x, v.Interface()) 4996 } 4997 runtime.GC() 4998 4999 for i, xi := range x { 5000 v := ValueOf(xi) 5001 for j := 0; j < v.Len(); j++ { 5002 k := v.Index(j).Elem().Interface() 5003 if k != uintptr(i*n+j) { 5004 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 5005 } 5006 } 5007 } 5008} 5009 5010func TestStructOfFieldName(t *testing.T) { 5011 // invalid field name "1nvalid" 5012 shouldPanic("has invalid name", func() { 5013 StructOf([]StructField{ 5014 {Name: "Valid", Type: TypeOf("")}, 5015 {Name: "1nvalid", Type: TypeOf("")}, 5016 }) 5017 }) 5018 5019 // invalid field name "+" 5020 shouldPanic("has invalid name", func() { 5021 StructOf([]StructField{ 5022 {Name: "Val1d", Type: TypeOf("")}, 5023 {Name: "+", Type: TypeOf("")}, 5024 }) 5025 }) 5026 5027 // no field name 5028 shouldPanic("has no name", func() { 5029 StructOf([]StructField{ 5030 {Name: "", Type: TypeOf("")}, 5031 }) 5032 }) 5033 5034 // verify creation of a struct with valid struct fields 5035 validFields := []StructField{ 5036 { 5037 Name: "φ", 5038 Type: TypeOf(""), 5039 }, 5040 { 5041 Name: "ValidName", 5042 Type: TypeOf(""), 5043 }, 5044 { 5045 Name: "Val1dNam5", 5046 Type: TypeOf(""), 5047 }, 5048 } 5049 5050 validStruct := StructOf(validFields) 5051 5052 const structStr = `struct { φ string; ValidName string; Val1dNam5 string }` 5053 if got, want := validStruct.String(), structStr; got != want { 5054 t.Errorf("StructOf(validFields).String()=%q, want %q", got, want) 5055 } 5056} 5057 5058func TestStructOf(t *testing.T) { 5059 // check construction and use of type not in binary 5060 fields := []StructField{ 5061 { 5062 Name: "S", 5063 Tag: "s", 5064 Type: TypeOf(""), 5065 }, 5066 { 5067 Name: "X", 5068 Tag: "x", 5069 Type: TypeOf(byte(0)), 5070 }, 5071 { 5072 Name: "Y", 5073 Type: TypeOf(uint64(0)), 5074 }, 5075 { 5076 Name: "Z", 5077 Type: TypeOf([3]uint16{}), 5078 }, 5079 } 5080 5081 st := StructOf(fields) 5082 v := New(st).Elem() 5083 runtime.GC() 5084 v.FieldByName("X").Set(ValueOf(byte(2))) 5085 v.FieldByIndex([]int{1}).Set(ValueOf(byte(1))) 5086 runtime.GC() 5087 5088 s := fmt.Sprint(v.Interface()) 5089 want := `{ 1 0 [0 0 0]}` 5090 if s != want { 5091 t.Errorf("constructed struct = %s, want %s", s, want) 5092 } 5093 const stStr = `struct { S string "s"; X uint8 "x"; Y uint64; Z [3]uint16 }` 5094 if got, want := st.String(), stStr; got != want { 5095 t.Errorf("StructOf(fields).String()=%q, want %q", got, want) 5096 } 5097 5098 // check the size, alignment and field offsets 5099 stt := TypeOf(struct { 5100 String string 5101 X byte 5102 Y uint64 5103 Z [3]uint16 5104 }{}) 5105 if st.Size() != stt.Size() { 5106 t.Errorf("constructed struct size = %v, want %v", st.Size(), stt.Size()) 5107 } 5108 if st.Align() != stt.Align() { 5109 t.Errorf("constructed struct align = %v, want %v", st.Align(), stt.Align()) 5110 } 5111 if st.FieldAlign() != stt.FieldAlign() { 5112 t.Errorf("constructed struct field align = %v, want %v", st.FieldAlign(), stt.FieldAlign()) 5113 } 5114 for i := 0; i < st.NumField(); i++ { 5115 o1 := st.Field(i).Offset 5116 o2 := stt.Field(i).Offset 5117 if o1 != o2 { 5118 t.Errorf("constructed struct field %v offset = %v, want %v", i, o1, o2) 5119 } 5120 } 5121 5122 // Check size and alignment with a trailing zero-sized field. 5123 st = StructOf([]StructField{ 5124 { 5125 Name: "F1", 5126 Type: TypeOf(byte(0)), 5127 }, 5128 { 5129 Name: "F2", 5130 Type: TypeOf([0]*byte{}), 5131 }, 5132 }) 5133 stt = TypeOf(struct { 5134 G1 byte 5135 G2 [0]*byte 5136 }{}) 5137 if st.Size() != stt.Size() { 5138 t.Errorf("constructed zero-padded struct size = %v, want %v", st.Size(), stt.Size()) 5139 } 5140 if st.Align() != stt.Align() { 5141 t.Errorf("constructed zero-padded struct align = %v, want %v", st.Align(), stt.Align()) 5142 } 5143 if st.FieldAlign() != stt.FieldAlign() { 5144 t.Errorf("constructed zero-padded struct field align = %v, want %v", st.FieldAlign(), stt.FieldAlign()) 5145 } 5146 for i := 0; i < st.NumField(); i++ { 5147 o1 := st.Field(i).Offset 5148 o2 := stt.Field(i).Offset 5149 if o1 != o2 { 5150 t.Errorf("constructed zero-padded struct field %v offset = %v, want %v", i, o1, o2) 5151 } 5152 } 5153 5154 // check duplicate names 5155 shouldPanic("duplicate field", func() { 5156 StructOf([]StructField{ 5157 {Name: "string", PkgPath: "p", Type: TypeOf("")}, 5158 {Name: "string", PkgPath: "p", Type: TypeOf("")}, 5159 }) 5160 }) 5161 shouldPanic("has no name", func() { 5162 StructOf([]StructField{ 5163 {Type: TypeOf("")}, 5164 {Name: "string", PkgPath: "p", Type: TypeOf("")}, 5165 }) 5166 }) 5167 shouldPanic("has no name", func() { 5168 StructOf([]StructField{ 5169 {Type: TypeOf("")}, 5170 {Type: TypeOf("")}, 5171 }) 5172 }) 5173 // check that type already in binary is found 5174 checkSameType(t, StructOf(fields[2:3]), struct{ Y uint64 }{}) 5175 5176 // gccgo used to fail this test. 5177 type structFieldType any 5178 checkSameType(t, 5179 StructOf([]StructField{ 5180 { 5181 Name: "F", 5182 Type: TypeOf((*structFieldType)(nil)).Elem(), 5183 }, 5184 }), 5185 struct{ F structFieldType }{}) 5186} 5187 5188func TestStructOfExportRules(t *testing.T) { 5189 type S1 struct{} 5190 type s2 struct{} 5191 type ΦType struct{} 5192 type φType struct{} 5193 5194 testPanic := func(i int, mustPanic bool, f func()) { 5195 defer func() { 5196 err := recover() 5197 if err == nil && mustPanic { 5198 t.Errorf("test-%d did not panic", i) 5199 } 5200 if err != nil && !mustPanic { 5201 t.Errorf("test-%d panicked: %v\n", i, err) 5202 } 5203 }() 5204 f() 5205 } 5206 5207 tests := []struct { 5208 field StructField 5209 mustPanic bool 5210 exported bool 5211 }{ 5212 { 5213 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf(S1{})}, 5214 exported: true, 5215 }, 5216 { 5217 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf((*S1)(nil))}, 5218 exported: true, 5219 }, 5220 { 5221 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf(s2{})}, 5222 mustPanic: true, 5223 }, 5224 { 5225 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf((*s2)(nil))}, 5226 mustPanic: true, 5227 }, 5228 { 5229 field: StructField{Name: "Name", Type: nil, PkgPath: ""}, 5230 mustPanic: true, 5231 }, 5232 { 5233 field: StructField{Name: "", Type: TypeOf(S1{}), PkgPath: ""}, 5234 mustPanic: true, 5235 }, 5236 { 5237 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf(S1{}), PkgPath: "other/pkg"}, 5238 mustPanic: true, 5239 }, 5240 { 5241 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf((*S1)(nil)), PkgPath: "other/pkg"}, 5242 mustPanic: true, 5243 }, 5244 { 5245 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf(s2{}), PkgPath: "other/pkg"}, 5246 mustPanic: true, 5247 }, 5248 { 5249 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf((*s2)(nil)), PkgPath: "other/pkg"}, 5250 mustPanic: true, 5251 }, 5252 { 5253 field: StructField{Name: "s2", Type: TypeOf(int(0)), PkgPath: "other/pkg"}, 5254 }, 5255 { 5256 field: StructField{Name: "s2", Type: TypeOf(int(0)), PkgPath: "other/pkg"}, 5257 }, 5258 { 5259 field: StructField{Name: "S", Type: TypeOf(S1{})}, 5260 exported: true, 5261 }, 5262 { 5263 field: StructField{Name: "S", Type: TypeOf((*S1)(nil))}, 5264 exported: true, 5265 }, 5266 { 5267 field: StructField{Name: "S", Type: TypeOf(s2{})}, 5268 exported: true, 5269 }, 5270 { 5271 field: StructField{Name: "S", Type: TypeOf((*s2)(nil))}, 5272 exported: true, 5273 }, 5274 { 5275 field: StructField{Name: "s", Type: TypeOf(S1{})}, 5276 mustPanic: true, 5277 }, 5278 { 5279 field: StructField{Name: "s", Type: TypeOf((*S1)(nil))}, 5280 mustPanic: true, 5281 }, 5282 { 5283 field: StructField{Name: "s", Type: TypeOf(s2{})}, 5284 mustPanic: true, 5285 }, 5286 { 5287 field: StructField{Name: "s", Type: TypeOf((*s2)(nil))}, 5288 mustPanic: true, 5289 }, 5290 { 5291 field: StructField{Name: "s", Type: TypeOf(S1{}), PkgPath: "other/pkg"}, 5292 }, 5293 { 5294 field: StructField{Name: "s", Type: TypeOf((*S1)(nil)), PkgPath: "other/pkg"}, 5295 }, 5296 { 5297 field: StructField{Name: "s", Type: TypeOf(s2{}), PkgPath: "other/pkg"}, 5298 }, 5299 { 5300 field: StructField{Name: "s", Type: TypeOf((*s2)(nil)), PkgPath: "other/pkg"}, 5301 }, 5302 { 5303 field: StructField{Name: "", Type: TypeOf(ΦType{})}, 5304 mustPanic: true, 5305 }, 5306 { 5307 field: StructField{Name: "", Type: TypeOf(φType{})}, 5308 mustPanic: true, 5309 }, 5310 { 5311 field: StructField{Name: "Φ", Type: TypeOf(0)}, 5312 exported: true, 5313 }, 5314 { 5315 field: StructField{Name: "φ", Type: TypeOf(0)}, 5316 exported: false, 5317 }, 5318 } 5319 5320 for i, test := range tests { 5321 testPanic(i, test.mustPanic, func() { 5322 typ := StructOf([]StructField{test.field}) 5323 if typ == nil { 5324 t.Errorf("test-%d: error creating struct type", i) 5325 return 5326 } 5327 field := typ.Field(0) 5328 n := field.Name 5329 if n == "" { 5330 panic("field.Name must not be empty") 5331 } 5332 exported := token.IsExported(n) 5333 if exported != test.exported { 5334 t.Errorf("test-%d: got exported=%v want exported=%v", i, exported, test.exported) 5335 } 5336 if field.PkgPath != test.field.PkgPath { 5337 t.Errorf("test-%d: got PkgPath=%q want pkgPath=%q", i, field.PkgPath, test.field.PkgPath) 5338 } 5339 }) 5340 } 5341} 5342 5343func TestStructOfGC(t *testing.T) { 5344 type T *uintptr 5345 tt := TypeOf(T(nil)) 5346 fields := []StructField{ 5347 {Name: "X", Type: tt}, 5348 {Name: "Y", Type: tt}, 5349 } 5350 st := StructOf(fields) 5351 5352 const n = 10000 5353 var x []any 5354 for i := 0; i < n; i++ { 5355 v := New(st).Elem() 5356 for j := 0; j < v.NumField(); j++ { 5357 p := new(uintptr) 5358 *p = uintptr(i*n + j) 5359 v.Field(j).Set(ValueOf(p).Convert(tt)) 5360 } 5361 x = append(x, v.Interface()) 5362 } 5363 runtime.GC() 5364 5365 for i, xi := range x { 5366 v := ValueOf(xi) 5367 for j := 0; j < v.NumField(); j++ { 5368 k := v.Field(j).Elem().Interface() 5369 if k != uintptr(i*n+j) { 5370 t.Errorf("lost x[%d].%c = %d, want %d", i, "XY"[j], k, i*n+j) 5371 } 5372 } 5373 } 5374} 5375 5376func TestStructOfAlg(t *testing.T) { 5377 st := StructOf([]StructField{{Name: "X", Tag: "x", Type: TypeOf(int(0))}}) 5378 v1 := New(st).Elem() 5379 v2 := New(st).Elem() 5380 if !DeepEqual(v1.Interface(), v1.Interface()) { 5381 t.Errorf("constructed struct %v not equal to itself", v1.Interface()) 5382 } 5383 v1.FieldByName("X").Set(ValueOf(int(1))) 5384 if i1, i2 := v1.Interface(), v2.Interface(); DeepEqual(i1, i2) { 5385 t.Errorf("constructed structs %v and %v should not be equal", i1, i2) 5386 } 5387 5388 st = StructOf([]StructField{{Name: "X", Tag: "x", Type: TypeOf([]int(nil))}}) 5389 v1 = New(st).Elem() 5390 shouldPanic("", func() { _ = v1.Interface() == v1.Interface() }) 5391} 5392 5393func TestStructOfGenericAlg(t *testing.T) { 5394 st1 := StructOf([]StructField{ 5395 {Name: "X", Tag: "x", Type: TypeOf(int64(0))}, 5396 {Name: "Y", Type: TypeOf(string(""))}, 5397 }) 5398 st := StructOf([]StructField{ 5399 {Name: "S0", Type: st1}, 5400 {Name: "S1", Type: st1}, 5401 }) 5402 5403 tests := []struct { 5404 rt Type 5405 idx []int 5406 }{ 5407 { 5408 rt: st, 5409 idx: []int{0, 1}, 5410 }, 5411 { 5412 rt: st1, 5413 idx: []int{1}, 5414 }, 5415 { 5416 rt: StructOf( 5417 []StructField{ 5418 {Name: "XX", Type: TypeOf([0]int{})}, 5419 {Name: "YY", Type: TypeOf("")}, 5420 }, 5421 ), 5422 idx: []int{1}, 5423 }, 5424 { 5425 rt: StructOf( 5426 []StructField{ 5427 {Name: "XX", Type: TypeOf([0]int{})}, 5428 {Name: "YY", Type: TypeOf("")}, 5429 {Name: "ZZ", Type: TypeOf([2]int{})}, 5430 }, 5431 ), 5432 idx: []int{1}, 5433 }, 5434 { 5435 rt: StructOf( 5436 []StructField{ 5437 {Name: "XX", Type: TypeOf([1]int{})}, 5438 {Name: "YY", Type: TypeOf("")}, 5439 }, 5440 ), 5441 idx: []int{1}, 5442 }, 5443 { 5444 rt: StructOf( 5445 []StructField{ 5446 {Name: "XX", Type: TypeOf([1]int{})}, 5447 {Name: "YY", Type: TypeOf("")}, 5448 {Name: "ZZ", Type: TypeOf([1]int{})}, 5449 }, 5450 ), 5451 idx: []int{1}, 5452 }, 5453 { 5454 rt: StructOf( 5455 []StructField{ 5456 {Name: "XX", Type: TypeOf([2]int{})}, 5457 {Name: "YY", Type: TypeOf("")}, 5458 {Name: "ZZ", Type: TypeOf([2]int{})}, 5459 }, 5460 ), 5461 idx: []int{1}, 5462 }, 5463 { 5464 rt: StructOf( 5465 []StructField{ 5466 {Name: "XX", Type: TypeOf(int64(0))}, 5467 {Name: "YY", Type: TypeOf(byte(0))}, 5468 {Name: "ZZ", Type: TypeOf("")}, 5469 }, 5470 ), 5471 idx: []int{2}, 5472 }, 5473 { 5474 rt: StructOf( 5475 []StructField{ 5476 {Name: "XX", Type: TypeOf(int64(0))}, 5477 {Name: "YY", Type: TypeOf(int64(0))}, 5478 {Name: "ZZ", Type: TypeOf("")}, 5479 {Name: "AA", Type: TypeOf([1]int64{})}, 5480 }, 5481 ), 5482 idx: []int{2}, 5483 }, 5484 } 5485 5486 for _, table := range tests { 5487 v1 := New(table.rt).Elem() 5488 v2 := New(table.rt).Elem() 5489 5490 if !DeepEqual(v1.Interface(), v1.Interface()) { 5491 t.Errorf("constructed struct %v not equal to itself", v1.Interface()) 5492 } 5493 5494 v1.FieldByIndex(table.idx).Set(ValueOf("abc")) 5495 v2.FieldByIndex(table.idx).Set(ValueOf("def")) 5496 if i1, i2 := v1.Interface(), v2.Interface(); DeepEqual(i1, i2) { 5497 t.Errorf("constructed structs %v and %v should not be equal", i1, i2) 5498 } 5499 5500 abc := "abc" 5501 v1.FieldByIndex(table.idx).Set(ValueOf(abc)) 5502 val := "+" + abc + "-" 5503 v2.FieldByIndex(table.idx).Set(ValueOf(val[1:4])) 5504 if i1, i2 := v1.Interface(), v2.Interface(); !DeepEqual(i1, i2) { 5505 t.Errorf("constructed structs %v and %v should be equal", i1, i2) 5506 } 5507 5508 // Test hash 5509 m := MakeMap(MapOf(table.rt, TypeOf(int(0)))) 5510 m.SetMapIndex(v1, ValueOf(1)) 5511 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() { 5512 t.Errorf("constructed structs %#v and %#v have different hashes", i1, i2) 5513 } 5514 5515 v2.FieldByIndex(table.idx).Set(ValueOf("abc")) 5516 if i1, i2 := v1.Interface(), v2.Interface(); !DeepEqual(i1, i2) { 5517 t.Errorf("constructed structs %v and %v should be equal", i1, i2) 5518 } 5519 5520 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() { 5521 t.Errorf("constructed structs %v and %v have different hashes", i1, i2) 5522 } 5523 } 5524} 5525 5526func TestStructOfDirectIface(t *testing.T) { 5527 { 5528 type T struct{ X [1]*byte } 5529 i1 := Zero(TypeOf(T{})).Interface() 5530 v1 := ValueOf(&i1).Elem() 5531 p1 := v1.InterfaceData()[1] 5532 5533 i2 := Zero(StructOf([]StructField{ 5534 { 5535 Name: "X", 5536 Type: ArrayOf(1, TypeOf((*int8)(nil))), 5537 }, 5538 })).Interface() 5539 v2 := ValueOf(&i2).Elem() 5540 p2 := v2.InterfaceData()[1] 5541 5542 if p1 != 0 { 5543 t.Errorf("got p1=%v. want=%v", p1, nil) 5544 } 5545 5546 if p2 != 0 { 5547 t.Errorf("got p2=%v. want=%v", p2, nil) 5548 } 5549 } 5550 { 5551 type T struct{ X [0]*byte } 5552 i1 := Zero(TypeOf(T{})).Interface() 5553 v1 := ValueOf(&i1).Elem() 5554 p1 := v1.InterfaceData()[1] 5555 5556 i2 := Zero(StructOf([]StructField{ 5557 { 5558 Name: "X", 5559 Type: ArrayOf(0, TypeOf((*int8)(nil))), 5560 }, 5561 })).Interface() 5562 v2 := ValueOf(&i2).Elem() 5563 p2 := v2.InterfaceData()[1] 5564 5565 if p1 == 0 { 5566 t.Errorf("got p1=%v. want=not-%v", p1, nil) 5567 } 5568 5569 if p2 == 0 { 5570 t.Errorf("got p2=%v. want=not-%v", p2, nil) 5571 } 5572 } 5573} 5574 5575type StructI int 5576 5577func (i StructI) Get() int { return int(i) } 5578 5579type StructIPtr int 5580 5581func (i *StructIPtr) Get() int { return int(*i) } 5582func (i *StructIPtr) Set(v int) { *(*int)(i) = v } 5583 5584type SettableStruct struct { 5585 SettableField int 5586} 5587 5588func (p *SettableStruct) Set(v int) { p.SettableField = v } 5589 5590type SettablePointer struct { 5591 SettableField *int 5592} 5593 5594func (p *SettablePointer) Set(v int) { *p.SettableField = v } 5595 5596func TestStructOfWithInterface(t *testing.T) { 5597 const want = 42 5598 type Iface interface { 5599 Get() int 5600 } 5601 type IfaceSet interface { 5602 Set(int) 5603 } 5604 tests := []struct { 5605 name string 5606 typ Type 5607 val Value 5608 impl bool 5609 }{ 5610 { 5611 name: "StructI", 5612 typ: TypeOf(StructI(want)), 5613 val: ValueOf(StructI(want)), 5614 impl: true, 5615 }, 5616 { 5617 name: "StructI", 5618 typ: PointerTo(TypeOf(StructI(want))), 5619 val: ValueOf(func() any { 5620 v := StructI(want) 5621 return &v 5622 }()), 5623 impl: true, 5624 }, 5625 { 5626 name: "StructIPtr", 5627 typ: PointerTo(TypeOf(StructIPtr(want))), 5628 val: ValueOf(func() any { 5629 v := StructIPtr(want) 5630 return &v 5631 }()), 5632 impl: true, 5633 }, 5634 { 5635 name: "StructIPtr", 5636 typ: TypeOf(StructIPtr(want)), 5637 val: ValueOf(StructIPtr(want)), 5638 impl: false, 5639 }, 5640 // { 5641 // typ: TypeOf((*Iface)(nil)).Elem(), // FIXME(sbinet): fix method.ifn/tfn 5642 // val: ValueOf(StructI(want)), 5643 // impl: true, 5644 // }, 5645 } 5646 5647 for i, table := range tests { 5648 for j := 0; j < 2; j++ { 5649 var fields []StructField 5650 if j == 1 { 5651 fields = append(fields, StructField{ 5652 Name: "Dummy", 5653 PkgPath: "", 5654 Type: TypeOf(int(0)), 5655 }) 5656 } 5657 fields = append(fields, StructField{ 5658 Name: table.name, 5659 Anonymous: true, 5660 PkgPath: "", 5661 Type: table.typ, 5662 }) 5663 5664 // We currently do not correctly implement methods 5665 // for embedded fields other than the first. 5666 // Therefore, for now, we expect those methods 5667 // to not exist. See issues 15924 and 20824. 5668 // When those issues are fixed, this test of panic 5669 // should be removed. 5670 if j == 1 && table.impl { 5671 func() { 5672 defer func() { 5673 if err := recover(); err == nil { 5674 t.Errorf("test-%d-%d did not panic", i, j) 5675 } 5676 }() 5677 _ = StructOf(fields) 5678 }() 5679 continue 5680 } 5681 5682 rt := StructOf(fields) 5683 rv := New(rt).Elem() 5684 rv.Field(j).Set(table.val) 5685 5686 if _, ok := rv.Interface().(Iface); ok != table.impl { 5687 if table.impl { 5688 t.Errorf("test-%d-%d: type=%v fails to implement Iface.\n", i, j, table.typ) 5689 } else { 5690 t.Errorf("test-%d-%d: type=%v should NOT implement Iface\n", i, j, table.typ) 5691 } 5692 continue 5693 } 5694 5695 if !table.impl { 5696 continue 5697 } 5698 5699 v := rv.Interface().(Iface).Get() 5700 if v != want { 5701 t.Errorf("test-%d-%d: x.Get()=%v. want=%v\n", i, j, v, want) 5702 } 5703 5704 fct := rv.MethodByName("Get") 5705 out := fct.Call(nil) 5706 if !DeepEqual(out[0].Interface(), want) { 5707 t.Errorf("test-%d-%d: x.Get()=%v. want=%v\n", i, j, out[0].Interface(), want) 5708 } 5709 } 5710 } 5711 5712 // Test an embedded nil pointer with pointer methods. 5713 fields := []StructField{{ 5714 Name: "StructIPtr", 5715 Anonymous: true, 5716 Type: PointerTo(TypeOf(StructIPtr(want))), 5717 }} 5718 rt := StructOf(fields) 5719 rv := New(rt).Elem() 5720 // This should panic since the pointer is nil. 5721 shouldPanic("", func() { 5722 rv.Interface().(IfaceSet).Set(want) 5723 }) 5724 5725 // Test an embedded nil pointer to a struct with pointer methods. 5726 5727 fields = []StructField{{ 5728 Name: "SettableStruct", 5729 Anonymous: true, 5730 Type: PointerTo(TypeOf(SettableStruct{})), 5731 }} 5732 rt = StructOf(fields) 5733 rv = New(rt).Elem() 5734 // This should panic since the pointer is nil. 5735 shouldPanic("", func() { 5736 rv.Interface().(IfaceSet).Set(want) 5737 }) 5738 5739 // The behavior is different if there is a second field, 5740 // since now an interface value holds a pointer to the struct 5741 // rather than just holding a copy of the struct. 5742 fields = []StructField{ 5743 { 5744 Name: "SettableStruct", 5745 Anonymous: true, 5746 Type: PointerTo(TypeOf(SettableStruct{})), 5747 }, 5748 { 5749 Name: "EmptyStruct", 5750 Anonymous: true, 5751 Type: StructOf(nil), 5752 }, 5753 } 5754 // With the current implementation this is expected to panic. 5755 // Ideally it should work and we should be able to see a panic 5756 // if we call the Set method. 5757 shouldPanic("", func() { 5758 StructOf(fields) 5759 }) 5760 5761 // Embed a field that can be stored directly in an interface, 5762 // with a second field. 5763 fields = []StructField{ 5764 { 5765 Name: "SettablePointer", 5766 Anonymous: true, 5767 Type: TypeOf(SettablePointer{}), 5768 }, 5769 { 5770 Name: "EmptyStruct", 5771 Anonymous: true, 5772 Type: StructOf(nil), 5773 }, 5774 } 5775 // With the current implementation this is expected to panic. 5776 // Ideally it should work and we should be able to call the 5777 // Set and Get methods. 5778 shouldPanic("", func() { 5779 StructOf(fields) 5780 }) 5781} 5782 5783func TestStructOfTooManyFields(t *testing.T) { 5784 // Bug Fix: #25402 - this should not panic 5785 tt := StructOf([]StructField{ 5786 {Name: "Time", Type: TypeOf(time.Time{}), Anonymous: true}, 5787 }) 5788 5789 if _, present := tt.MethodByName("After"); !present { 5790 t.Errorf("Expected method `After` to be found") 5791 } 5792} 5793 5794func TestStructOfDifferentPkgPath(t *testing.T) { 5795 fields := []StructField{ 5796 { 5797 Name: "f1", 5798 PkgPath: "p1", 5799 Type: TypeOf(int(0)), 5800 }, 5801 { 5802 Name: "f2", 5803 PkgPath: "p2", 5804 Type: TypeOf(int(0)), 5805 }, 5806 } 5807 shouldPanic("different PkgPath", func() { 5808 StructOf(fields) 5809 }) 5810} 5811 5812func TestChanOf(t *testing.T) { 5813 // check construction and use of type not in binary 5814 type T string 5815 ct := ChanOf(BothDir, TypeOf(T(""))) 5816 v := MakeChan(ct, 2) 5817 runtime.GC() 5818 v.Send(ValueOf(T("hello"))) 5819 runtime.GC() 5820 v.Send(ValueOf(T("world"))) 5821 runtime.GC() 5822 5823 sv1, _ := v.Recv() 5824 sv2, _ := v.Recv() 5825 s1 := sv1.String() 5826 s2 := sv2.String() 5827 if s1 != "hello" || s2 != "world" { 5828 t.Errorf("constructed chan: have %q, %q, want %q, %q", s1, s2, "hello", "world") 5829 } 5830 5831 // check that type already in binary is found 5832 type T1 int 5833 checkSameType(t, ChanOf(BothDir, TypeOf(T1(1))), (chan T1)(nil)) 5834 5835 // Check arrow token association in undefined chan types. 5836 var left chan<- chan T 5837 var right chan (<-chan T) 5838 tLeft := ChanOf(SendDir, ChanOf(BothDir, TypeOf(T("")))) 5839 tRight := ChanOf(BothDir, ChanOf(RecvDir, TypeOf(T("")))) 5840 if tLeft != TypeOf(left) { 5841 t.Errorf("chan<-chan: have %s, want %T", tLeft, left) 5842 } 5843 if tRight != TypeOf(right) { 5844 t.Errorf("chan<-chan: have %s, want %T", tRight, right) 5845 } 5846} 5847 5848func TestChanOfDir(t *testing.T) { 5849 // check construction and use of type not in binary 5850 type T string 5851 crt := ChanOf(RecvDir, TypeOf(T(""))) 5852 cst := ChanOf(SendDir, TypeOf(T(""))) 5853 5854 // check that type already in binary is found 5855 type T1 int 5856 checkSameType(t, ChanOf(RecvDir, TypeOf(T1(1))), (<-chan T1)(nil)) 5857 checkSameType(t, ChanOf(SendDir, TypeOf(T1(1))), (chan<- T1)(nil)) 5858 5859 // check String form of ChanDir 5860 if crt.ChanDir().String() != "<-chan" { 5861 t.Errorf("chan dir: have %q, want %q", crt.ChanDir().String(), "<-chan") 5862 } 5863 if cst.ChanDir().String() != "chan<-" { 5864 t.Errorf("chan dir: have %q, want %q", cst.ChanDir().String(), "chan<-") 5865 } 5866} 5867 5868func TestChanOfGC(t *testing.T) { 5869 done := make(chan bool, 1) 5870 go func() { 5871 select { 5872 case <-done: 5873 case <-time.After(5 * time.Second): 5874 panic("deadlock in TestChanOfGC") 5875 } 5876 }() 5877 5878 defer func() { 5879 done <- true 5880 }() 5881 5882 type T *uintptr 5883 tt := TypeOf(T(nil)) 5884 ct := ChanOf(BothDir, tt) 5885 5886 // NOTE: The garbage collector handles allocated channels specially, 5887 // so we have to save pointers to channels in x; the pointer code will 5888 // use the gc info in the newly constructed chan type. 5889 const n = 100 5890 var x []any 5891 for i := 0; i < n; i++ { 5892 v := MakeChan(ct, n) 5893 for j := 0; j < n; j++ { 5894 p := new(uintptr) 5895 *p = uintptr(i*n + j) 5896 v.Send(ValueOf(p).Convert(tt)) 5897 } 5898 pv := New(ct) 5899 pv.Elem().Set(v) 5900 x = append(x, pv.Interface()) 5901 } 5902 runtime.GC() 5903 5904 for i, xi := range x { 5905 v := ValueOf(xi).Elem() 5906 for j := 0; j < n; j++ { 5907 pv, _ := v.Recv() 5908 k := pv.Elem().Interface() 5909 if k != uintptr(i*n+j) { 5910 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 5911 } 5912 } 5913 } 5914} 5915 5916func TestMapOf(t *testing.T) { 5917 // check construction and use of type not in binary 5918 type K string 5919 type V float64 5920 5921 v := MakeMap(MapOf(TypeOf(K("")), TypeOf(V(0)))) 5922 runtime.GC() 5923 v.SetMapIndex(ValueOf(K("a")), ValueOf(V(1))) 5924 runtime.GC() 5925 5926 s := fmt.Sprint(v.Interface()) 5927 want := "map[a:1]" 5928 if s != want { 5929 t.Errorf("constructed map = %s, want %s", s, want) 5930 } 5931 5932 // check that type already in binary is found 5933 checkSameType(t, MapOf(TypeOf(V(0)), TypeOf(K(""))), map[V]K(nil)) 5934 5935 // check that invalid key type panics 5936 shouldPanic("invalid key type", func() { MapOf(TypeOf((func())(nil)), TypeOf(false)) }) 5937} 5938 5939func TestMapOfGCKeys(t *testing.T) { 5940 type T *uintptr 5941 tt := TypeOf(T(nil)) 5942 mt := MapOf(tt, TypeOf(false)) 5943 5944 // NOTE: The garbage collector handles allocated maps specially, 5945 // so we have to save pointers to maps in x; the pointer code will 5946 // use the gc info in the newly constructed map type. 5947 const n = 100 5948 var x []any 5949 for i := 0; i < n; i++ { 5950 v := MakeMap(mt) 5951 for j := 0; j < n; j++ { 5952 p := new(uintptr) 5953 *p = uintptr(i*n + j) 5954 v.SetMapIndex(ValueOf(p).Convert(tt), ValueOf(true)) 5955 } 5956 pv := New(mt) 5957 pv.Elem().Set(v) 5958 x = append(x, pv.Interface()) 5959 } 5960 runtime.GC() 5961 5962 for i, xi := range x { 5963 v := ValueOf(xi).Elem() 5964 var out []int 5965 for _, kv := range v.MapKeys() { 5966 out = append(out, int(kv.Elem().Interface().(uintptr))) 5967 } 5968 sort.Ints(out) 5969 for j, k := range out { 5970 if k != i*n+j { 5971 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 5972 } 5973 } 5974 } 5975} 5976 5977func TestMapOfGCValues(t *testing.T) { 5978 type T *uintptr 5979 tt := TypeOf(T(nil)) 5980 mt := MapOf(TypeOf(1), tt) 5981 5982 // NOTE: The garbage collector handles allocated maps specially, 5983 // so we have to save pointers to maps in x; the pointer code will 5984 // use the gc info in the newly constructed map type. 5985 const n = 100 5986 var x []any 5987 for i := 0; i < n; i++ { 5988 v := MakeMap(mt) 5989 for j := 0; j < n; j++ { 5990 p := new(uintptr) 5991 *p = uintptr(i*n + j) 5992 v.SetMapIndex(ValueOf(j), ValueOf(p).Convert(tt)) 5993 } 5994 pv := New(mt) 5995 pv.Elem().Set(v) 5996 x = append(x, pv.Interface()) 5997 } 5998 runtime.GC() 5999 6000 for i, xi := range x { 6001 v := ValueOf(xi).Elem() 6002 for j := 0; j < n; j++ { 6003 k := v.MapIndex(ValueOf(j)).Elem().Interface().(uintptr) 6004 if k != uintptr(i*n+j) { 6005 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j) 6006 } 6007 } 6008 } 6009} 6010 6011func TestTypelinksSorted(t *testing.T) { 6012 var last string 6013 for i, n := range TypeLinks() { 6014 if n < last { 6015 t.Errorf("typelinks not sorted: %q [%d] > %q [%d]", last, i-1, n, i) 6016 } 6017 last = n 6018 } 6019} 6020 6021func TestFuncOf(t *testing.T) { 6022 // check construction and use of type not in binary 6023 type K string 6024 type V float64 6025 6026 fn := func(args []Value) []Value { 6027 if len(args) != 1 { 6028 t.Errorf("args == %v, want exactly one arg", args) 6029 } else if args[0].Type() != TypeOf(K("")) { 6030 t.Errorf("args[0] is type %v, want %v", args[0].Type(), TypeOf(K(""))) 6031 } else if args[0].String() != "gopher" { 6032 t.Errorf("args[0] = %q, want %q", args[0].String(), "gopher") 6033 } 6034 return []Value{ValueOf(V(3.14))} 6035 } 6036 v := MakeFunc(FuncOf([]Type{TypeOf(K(""))}, []Type{TypeOf(V(0))}, false), fn) 6037 6038 outs := v.Call([]Value{ValueOf(K("gopher"))}) 6039 if len(outs) != 1 { 6040 t.Fatalf("v.Call returned %v, want exactly one result", outs) 6041 } else if outs[0].Type() != TypeOf(V(0)) { 6042 t.Fatalf("c.Call[0] is type %v, want %v", outs[0].Type(), TypeOf(V(0))) 6043 } 6044 f := outs[0].Float() 6045 if f != 3.14 { 6046 t.Errorf("constructed func returned %f, want %f", f, 3.14) 6047 } 6048 6049 // check that types already in binary are found 6050 type T1 int 6051 testCases := []struct { 6052 in, out []Type 6053 variadic bool 6054 want any 6055 }{ 6056 {in: []Type{TypeOf(T1(0))}, want: (func(T1))(nil)}, 6057 {in: []Type{TypeOf(int(0))}, want: (func(int))(nil)}, 6058 {in: []Type{SliceOf(TypeOf(int(0)))}, variadic: true, want: (func(...int))(nil)}, 6059 {in: []Type{TypeOf(int(0))}, out: []Type{TypeOf(false)}, want: (func(int) bool)(nil)}, 6060 {in: []Type{TypeOf(int(0))}, out: []Type{TypeOf(false), TypeOf("")}, want: (func(int) (bool, string))(nil)}, 6061 } 6062 for _, tt := range testCases { 6063 checkSameType(t, FuncOf(tt.in, tt.out, tt.variadic), tt.want) 6064 } 6065 6066 // check that variadic requires last element be a slice. 6067 FuncOf([]Type{TypeOf(1), TypeOf(""), SliceOf(TypeOf(false))}, nil, true) 6068 shouldPanic("must be slice", func() { FuncOf([]Type{TypeOf(0), TypeOf(""), TypeOf(false)}, nil, true) }) 6069 shouldPanic("must be slice", func() { FuncOf(nil, nil, true) }) 6070} 6071 6072type B1 struct { 6073 X int 6074 Y int 6075 Z int 6076} 6077 6078func BenchmarkFieldByName1(b *testing.B) { 6079 t := TypeOf(B1{}) 6080 b.RunParallel(func(pb *testing.PB) { 6081 for pb.Next() { 6082 t.FieldByName("Z") 6083 } 6084 }) 6085} 6086 6087func BenchmarkFieldByName2(b *testing.B) { 6088 t := TypeOf(S3{}) 6089 b.RunParallel(func(pb *testing.PB) { 6090 for pb.Next() { 6091 t.FieldByName("B") 6092 } 6093 }) 6094} 6095 6096type R0 struct { 6097 *R1 6098 *R2 6099 *R3 6100 *R4 6101} 6102 6103type R1 struct { 6104 *R5 6105 *R6 6106 *R7 6107 *R8 6108} 6109 6110type R2 R1 6111type R3 R1 6112type R4 R1 6113 6114type R5 struct { 6115 *R9 6116 *R10 6117 *R11 6118 *R12 6119} 6120 6121type R6 R5 6122type R7 R5 6123type R8 R5 6124 6125type R9 struct { 6126 *R13 6127 *R14 6128 *R15 6129 *R16 6130} 6131 6132type R10 R9 6133type R11 R9 6134type R12 R9 6135 6136type R13 struct { 6137 *R17 6138 *R18 6139 *R19 6140 *R20 6141} 6142 6143type R14 R13 6144type R15 R13 6145type R16 R13 6146 6147type R17 struct { 6148 *R21 6149 *R22 6150 *R23 6151 *R24 6152} 6153 6154type R18 R17 6155type R19 R17 6156type R20 R17 6157 6158type R21 struct { 6159 X int 6160} 6161 6162type R22 R21 6163type R23 R21 6164type R24 R21 6165 6166func TestEmbed(t *testing.T) { 6167 typ := TypeOf(R0{}) 6168 f, ok := typ.FieldByName("X") 6169 if ok { 6170 t.Fatalf(`FieldByName("X") should fail, returned %v`, f.Index) 6171 } 6172} 6173 6174func BenchmarkFieldByName3(b *testing.B) { 6175 t := TypeOf(R0{}) 6176 b.RunParallel(func(pb *testing.PB) { 6177 for pb.Next() { 6178 t.FieldByName("X") 6179 } 6180 }) 6181} 6182 6183type S struct { 6184 i1 int64 6185 i2 int64 6186} 6187 6188func BenchmarkInterfaceBig(b *testing.B) { 6189 v := ValueOf(S{}) 6190 b.RunParallel(func(pb *testing.PB) { 6191 for pb.Next() { 6192 v.Interface() 6193 } 6194 }) 6195 b.StopTimer() 6196} 6197 6198func TestAllocsInterfaceBig(t *testing.T) { 6199 if testing.Short() { 6200 t.Skip("skipping malloc count in short mode") 6201 } 6202 v := ValueOf(S{}) 6203 if allocs := testing.AllocsPerRun(100, func() { v.Interface() }); allocs > 0 { 6204 t.Error("allocs:", allocs) 6205 } 6206} 6207 6208func BenchmarkInterfaceSmall(b *testing.B) { 6209 v := ValueOf(int64(0)) 6210 b.RunParallel(func(pb *testing.PB) { 6211 for pb.Next() { 6212 v.Interface() 6213 } 6214 }) 6215} 6216 6217func TestAllocsInterfaceSmall(t *testing.T) { 6218 if testing.Short() { 6219 t.Skip("skipping malloc count in short mode") 6220 } 6221 v := ValueOf(int64(0)) 6222 if allocs := testing.AllocsPerRun(100, func() { v.Interface() }); allocs > 0 { 6223 t.Error("allocs:", allocs) 6224 } 6225} 6226 6227// An exhaustive is a mechanism for writing exhaustive or stochastic tests. 6228// The basic usage is: 6229// 6230// for x.Next() { 6231// ... code using x.Maybe() or x.Choice(n) to create test cases ... 6232// } 6233// 6234// Each iteration of the loop returns a different set of results, until all 6235// possible result sets have been explored. It is okay for different code paths 6236// to make different method call sequences on x, but there must be no 6237// other source of non-determinism in the call sequences. 6238// 6239// When faced with a new decision, x chooses randomly. Future explorations 6240// of that path will choose successive values for the result. Thus, stopping 6241// the loop after a fixed number of iterations gives somewhat stochastic 6242// testing. 6243// 6244// Example: 6245// 6246// for x.Next() { 6247// v := make([]bool, x.Choose(4)) 6248// for i := range v { 6249// v[i] = x.Maybe() 6250// } 6251// fmt.Println(v) 6252// } 6253// 6254// prints (in some order): 6255// 6256// [] 6257// [false] 6258// [true] 6259// [false false] 6260// [false true] 6261// ... 6262// [true true] 6263// [false false false] 6264// ... 6265// [true true true] 6266// [false false false false] 6267// ... 6268// [true true true true] 6269// 6270type exhaustive struct { 6271 r *rand.Rand 6272 pos int 6273 last []choice 6274} 6275 6276type choice struct { 6277 off int 6278 n int 6279 max int 6280} 6281 6282func (x *exhaustive) Next() bool { 6283 if x.r == nil { 6284 x.r = rand.New(rand.NewSource(time.Now().UnixNano())) 6285 } 6286 x.pos = 0 6287 if x.last == nil { 6288 x.last = []choice{} 6289 return true 6290 } 6291 for i := len(x.last) - 1; i >= 0; i-- { 6292 c := &x.last[i] 6293 if c.n+1 < c.max { 6294 c.n++ 6295 x.last = x.last[:i+1] 6296 return true 6297 } 6298 } 6299 return false 6300} 6301 6302func (x *exhaustive) Choose(max int) int { 6303 if x.pos >= len(x.last) { 6304 x.last = append(x.last, choice{x.r.Intn(max), 0, max}) 6305 } 6306 c := &x.last[x.pos] 6307 x.pos++ 6308 if c.max != max { 6309 panic("inconsistent use of exhaustive tester") 6310 } 6311 return (c.n + c.off) % max 6312} 6313 6314func (x *exhaustive) Maybe() bool { 6315 return x.Choose(2) == 1 6316} 6317 6318func GCFunc(args []Value) []Value { 6319 runtime.GC() 6320 return []Value{} 6321} 6322 6323func TestReflectFuncTraceback(t *testing.T) { 6324 f := MakeFunc(TypeOf(func() {}), GCFunc) 6325 f.Call([]Value{}) 6326} 6327 6328func TestReflectMethodTraceback(t *testing.T) { 6329 p := Point{3, 4} 6330 m := ValueOf(p).MethodByName("GCMethod") 6331 i := ValueOf(m.Interface()).Call([]Value{ValueOf(5)})[0].Int() 6332 if i != 8 { 6333 t.Errorf("Call returned %d; want 8", i) 6334 } 6335} 6336 6337func TestSmallZero(t *testing.T) { 6338 type T [10]byte 6339 typ := TypeOf(T{}) 6340 if allocs := testing.AllocsPerRun(100, func() { Zero(typ) }); allocs > 0 { 6341 t.Errorf("Creating small zero values caused %f allocs, want 0", allocs) 6342 } 6343} 6344 6345func TestBigZero(t *testing.T) { 6346 const size = 1 << 10 6347 var v [size]byte 6348 z := Zero(ValueOf(v).Type()).Interface().([size]byte) 6349 for i := 0; i < size; i++ { 6350 if z[i] != 0 { 6351 t.Fatalf("Zero object not all zero, index %d", i) 6352 } 6353 } 6354} 6355 6356func TestZeroSet(t *testing.T) { 6357 type T [16]byte 6358 type S struct { 6359 a uint64 6360 T T 6361 b uint64 6362 } 6363 v := S{ 6364 a: 0xaaaaaaaaaaaaaaaa, 6365 T: T{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9}, 6366 b: 0xbbbbbbbbbbbbbbbb, 6367 } 6368 ValueOf(&v).Elem().Field(1).Set(Zero(TypeOf(T{}))) 6369 if v != (S{ 6370 a: 0xaaaaaaaaaaaaaaaa, 6371 b: 0xbbbbbbbbbbbbbbbb, 6372 }) { 6373 t.Fatalf("Setting a field to a Zero value didn't work") 6374 } 6375} 6376 6377func TestFieldByIndexNil(t *testing.T) { 6378 type P struct { 6379 F int 6380 } 6381 type T struct { 6382 *P 6383 } 6384 v := ValueOf(T{}) 6385 6386 v.FieldByName("P") // should be fine 6387 6388 defer func() { 6389 if err := recover(); err == nil { 6390 t.Fatalf("no error") 6391 } else if !strings.Contains(fmt.Sprint(err), "nil pointer to embedded struct") { 6392 t.Fatalf(`err=%q, wanted error containing "nil pointer to embedded struct"`, err) 6393 } 6394 }() 6395 v.FieldByName("F") // should panic 6396 6397 t.Fatalf("did not panic") 6398} 6399 6400// Given 6401// type Outer struct { 6402// *Inner 6403// ... 6404// } 6405// the compiler generates the implementation of (*Outer).M dispatching to the embedded Inner. 6406// The implementation is logically: 6407// func (p *Outer) M() { 6408// (p.Inner).M() 6409// } 6410// but since the only change here is the replacement of one pointer receiver with another, 6411// the actual generated code overwrites the original receiver with the p.Inner pointer and 6412// then jumps to the M method expecting the *Inner receiver. 6413// 6414// During reflect.Value.Call, we create an argument frame and the associated data structures 6415// to describe it to the garbage collector, populate the frame, call reflect.call to 6416// run a function call using that frame, and then copy the results back out of the frame. 6417// The reflect.call function does a memmove of the frame structure onto the 6418// stack (to set up the inputs), runs the call, and the memmoves the stack back to 6419// the frame structure (to preserve the outputs). 6420// 6421// Originally reflect.call did not distinguish inputs from outputs: both memmoves 6422// were for the full stack frame. However, in the case where the called function was 6423// one of these wrappers, the rewritten receiver is almost certainly a different type 6424// than the original receiver. This is not a problem on the stack, where we use the 6425// program counter to determine the type information and understand that 6426// during (*Outer).M the receiver is an *Outer while during (*Inner).M the receiver in the same 6427// memory word is now an *Inner. But in the statically typed argument frame created 6428// by reflect, the receiver is always an *Outer. Copying the modified receiver pointer 6429// off the stack into the frame will store an *Inner there, and then if a garbage collection 6430// happens to scan that argument frame before it is discarded, it will scan the *Inner 6431// memory as if it were an *Outer. If the two have different memory layouts, the 6432// collection will interpret the memory incorrectly. 6433// 6434// One such possible incorrect interpretation is to treat two arbitrary memory words 6435// (Inner.P1 and Inner.P2 below) as an interface (Outer.R below). Because interpreting 6436// an interface requires dereferencing the itab word, the misinterpretation will try to 6437// deference Inner.P1, causing a crash during garbage collection. 6438// 6439// This came up in a real program in issue 7725. 6440 6441type Outer struct { 6442 *Inner 6443 R io.Reader 6444} 6445 6446type Inner struct { 6447 X *Outer 6448 P1 uintptr 6449 P2 uintptr 6450} 6451 6452func (pi *Inner) M() { 6453 // Clear references to pi so that the only way the 6454 // garbage collection will find the pointer is in the 6455 // argument frame, typed as a *Outer. 6456 pi.X.Inner = nil 6457 6458 // Set up an interface value that will cause a crash. 6459 // P1 = 1 is a non-zero, so the interface looks non-nil. 6460 // P2 = pi ensures that the data word points into the 6461 // allocated heap; if not the collection skips the interface 6462 // value as irrelevant, without dereferencing P1. 6463 pi.P1 = 1 6464 pi.P2 = uintptr(unsafe.Pointer(pi)) 6465} 6466 6467func TestCallMethodJump(t *testing.T) { 6468 // In reflect.Value.Call, trigger a garbage collection after reflect.call 6469 // returns but before the args frame has been discarded. 6470 // This is a little clumsy but makes the failure repeatable. 6471 *CallGC = true 6472 6473 p := &Outer{Inner: new(Inner)} 6474 p.Inner.X = p 6475 ValueOf(p).Method(0).Call(nil) 6476 6477 // Stop garbage collecting during reflect.call. 6478 *CallGC = false 6479} 6480 6481func TestCallArgLive(t *testing.T) { 6482 type T struct{ X, Y *string } // pointerful aggregate 6483 6484 F := func(t T) { *t.X = "ok" } 6485 6486 // In reflect.Value.Call, trigger a garbage collection in reflect.call 6487 // between marshaling argument and the actual call. 6488 *CallGC = true 6489 6490 x := new(string) 6491 runtime.SetFinalizer(x, func(p *string) { 6492 if *p != "ok" { 6493 t.Errorf("x dead prematurely") 6494 } 6495 }) 6496 v := T{x, nil} 6497 6498 ValueOf(F).Call([]Value{ValueOf(v)}) 6499 6500 // Stop garbage collecting during reflect.call. 6501 *CallGC = false 6502} 6503 6504func TestMakeFuncStackCopy(t *testing.T) { 6505 target := func(in []Value) []Value { 6506 runtime.GC() 6507 useStack(16) 6508 return []Value{ValueOf(9)} 6509 } 6510 6511 var concrete func(*int, int) int 6512 fn := MakeFunc(ValueOf(concrete).Type(), target) 6513 ValueOf(&concrete).Elem().Set(fn) 6514 x := concrete(nil, 7) 6515 if x != 9 { 6516 t.Errorf("have %#q want 9", x) 6517 } 6518} 6519 6520// use about n KB of stack 6521func useStack(n int) { 6522 if n == 0 { 6523 return 6524 } 6525 var b [1024]byte // makes frame about 1KB 6526 useStack(n - 1 + int(b[99])) 6527} 6528 6529type Impl struct{} 6530 6531func (Impl) F() {} 6532 6533func TestValueString(t *testing.T) { 6534 rv := ValueOf(Impl{}) 6535 if rv.String() != "<reflect_test.Impl Value>" { 6536 t.Errorf("ValueOf(Impl{}).String() = %q, want %q", rv.String(), "<reflect_test.Impl Value>") 6537 } 6538 6539 method := rv.Method(0) 6540 if method.String() != "<func() Value>" { 6541 t.Errorf("ValueOf(Impl{}).Method(0).String() = %q, want %q", method.String(), "<func() Value>") 6542 } 6543} 6544 6545func TestInvalid(t *testing.T) { 6546 // Used to have inconsistency between IsValid() and Kind() != Invalid. 6547 type T struct{ v any } 6548 6549 v := ValueOf(T{}).Field(0) 6550 if v.IsValid() != true || v.Kind() != Interface { 6551 t.Errorf("field: IsValid=%v, Kind=%v, want true, Interface", v.IsValid(), v.Kind()) 6552 } 6553 v = v.Elem() 6554 if v.IsValid() != false || v.Kind() != Invalid { 6555 t.Errorf("field elem: IsValid=%v, Kind=%v, want false, Invalid", v.IsValid(), v.Kind()) 6556 } 6557} 6558 6559// Issue 8917. 6560func TestLargeGCProg(t *testing.T) { 6561 fv := ValueOf(func([256]*byte) {}) 6562 fv.Call([]Value{ValueOf([256]*byte{})}) 6563} 6564 6565func fieldIndexRecover(t Type, i int) (recovered any) { 6566 defer func() { 6567 recovered = recover() 6568 }() 6569 6570 t.Field(i) 6571 return 6572} 6573 6574// Issue 15046. 6575func TestTypeFieldOutOfRangePanic(t *testing.T) { 6576 typ := TypeOf(struct{ X int }{10}) 6577 testIndices := [...]struct { 6578 i int 6579 mustPanic bool 6580 }{ 6581 0: {-2, true}, 6582 1: {0, false}, 6583 2: {1, true}, 6584 3: {1 << 10, true}, 6585 } 6586 for i, tt := range testIndices { 6587 recoveredErr := fieldIndexRecover(typ, tt.i) 6588 if tt.mustPanic { 6589 if recoveredErr == nil { 6590 t.Errorf("#%d: fieldIndex %d expected to panic", i, tt.i) 6591 } 6592 } else { 6593 if recoveredErr != nil { 6594 t.Errorf("#%d: got err=%v, expected no panic", i, recoveredErr) 6595 } 6596 } 6597 } 6598} 6599 6600// Issue 9179. 6601func TestCallGC(t *testing.T) { 6602 f := func(a, b, c, d, e string) { 6603 } 6604 g := func(in []Value) []Value { 6605 runtime.GC() 6606 return nil 6607 } 6608 typ := ValueOf(f).Type() 6609 f2 := MakeFunc(typ, g).Interface().(func(string, string, string, string, string)) 6610 f2("four", "five5", "six666", "seven77", "eight888") 6611} 6612 6613// Issue 18635 (function version). 6614func TestKeepFuncLive(t *testing.T) { 6615 // Test that we keep makeFuncImpl live as long as it is 6616 // referenced on the stack. 6617 typ := TypeOf(func(i int) {}) 6618 var f, g func(in []Value) []Value 6619 f = func(in []Value) []Value { 6620 clobber() 6621 i := int(in[0].Int()) 6622 if i > 0 { 6623 // We can't use Value.Call here because 6624 // runtime.call* will keep the makeFuncImpl 6625 // alive. However, by converting it to an 6626 // interface value and calling that, 6627 // reflect.callReflect is the only thing that 6628 // can keep the makeFuncImpl live. 6629 // 6630 // Alternate between f and g so that if we do 6631 // reuse the memory prematurely it's more 6632 // likely to get obviously corrupted. 6633 MakeFunc(typ, g).Interface().(func(i int))(i - 1) 6634 } 6635 return nil 6636 } 6637 g = func(in []Value) []Value { 6638 clobber() 6639 i := int(in[0].Int()) 6640 MakeFunc(typ, f).Interface().(func(i int))(i) 6641 return nil 6642 } 6643 MakeFunc(typ, f).Call([]Value{ValueOf(10)}) 6644} 6645 6646type UnExportedFirst int 6647 6648func (i UnExportedFirst) ΦExported() {} 6649func (i UnExportedFirst) unexported() {} 6650 6651// Issue 21177 6652func TestMethodByNameUnExportedFirst(t *testing.T) { 6653 defer func() { 6654 if recover() != nil { 6655 t.Errorf("should not panic") 6656 } 6657 }() 6658 typ := TypeOf(UnExportedFirst(0)) 6659 m, _ := typ.MethodByName("ΦExported") 6660 if m.Name != "ΦExported" { 6661 t.Errorf("got %s, expected ΦExported", m.Name) 6662 } 6663} 6664 6665// Issue 18635 (method version). 6666type KeepMethodLive struct{} 6667 6668func (k KeepMethodLive) Method1(i int) { 6669 clobber() 6670 if i > 0 { 6671 ValueOf(k).MethodByName("Method2").Interface().(func(i int))(i - 1) 6672 } 6673} 6674 6675func (k KeepMethodLive) Method2(i int) { 6676 clobber() 6677 ValueOf(k).MethodByName("Method1").Interface().(func(i int))(i) 6678} 6679 6680func TestKeepMethodLive(t *testing.T) { 6681 // Test that we keep methodValue live as long as it is 6682 // referenced on the stack. 6683 KeepMethodLive{}.Method1(10) 6684} 6685 6686// clobber tries to clobber unreachable memory. 6687func clobber() { 6688 runtime.GC() 6689 for i := 1; i < 32; i++ { 6690 for j := 0; j < 10; j++ { 6691 obj := make([]*byte, i) 6692 sink = obj 6693 } 6694 } 6695 runtime.GC() 6696} 6697 6698func TestFuncLayout(t *testing.T) { 6699 align := func(x uintptr) uintptr { 6700 return (x + goarch.PtrSize - 1) &^ (goarch.PtrSize - 1) 6701 } 6702 var r []byte 6703 if goarch.PtrSize == 4 { 6704 r = []byte{0, 0, 0, 1} 6705 } else { 6706 r = []byte{0, 0, 1} 6707 } 6708 6709 type S struct { 6710 a, b uintptr 6711 c, d *byte 6712 } 6713 6714 type test struct { 6715 rcvr, typ Type 6716 size, argsize, retOffset uintptr 6717 stack, gc, inRegs, outRegs []byte // pointer bitmap: 1 is pointer, 0 is scalar 6718 intRegs, floatRegs int 6719 floatRegSize uintptr 6720 } 6721 tests := []test{ 6722 { 6723 typ: ValueOf(func(a, b string) string { return "" }).Type(), 6724 size: 6 * goarch.PtrSize, 6725 argsize: 4 * goarch.PtrSize, 6726 retOffset: 4 * goarch.PtrSize, 6727 stack: []byte{1, 0, 1, 0, 1}, 6728 gc: []byte{1, 0, 1, 0, 1}, 6729 }, 6730 { 6731 typ: ValueOf(func(a, b, c uint32, p *byte, d uint16) {}).Type(), 6732 size: align(align(3*4) + goarch.PtrSize + 2), 6733 argsize: align(3*4) + goarch.PtrSize + 2, 6734 retOffset: align(align(3*4) + goarch.PtrSize + 2), 6735 stack: r, 6736 gc: r, 6737 }, 6738 { 6739 typ: ValueOf(func(a map[int]int, b uintptr, c any) {}).Type(), 6740 size: 4 * goarch.PtrSize, 6741 argsize: 4 * goarch.PtrSize, 6742 retOffset: 4 * goarch.PtrSize, 6743 stack: []byte{1, 0, 1, 1}, 6744 gc: []byte{1, 0, 1, 1}, 6745 }, 6746 { 6747 typ: ValueOf(func(a S) {}).Type(), 6748 size: 4 * goarch.PtrSize, 6749 argsize: 4 * goarch.PtrSize, 6750 retOffset: 4 * goarch.PtrSize, 6751 stack: []byte{0, 0, 1, 1}, 6752 gc: []byte{0, 0, 1, 1}, 6753 }, 6754 { 6755 rcvr: ValueOf((*byte)(nil)).Type(), 6756 typ: ValueOf(func(a uintptr, b *int) {}).Type(), 6757 size: 3 * goarch.PtrSize, 6758 argsize: 3 * goarch.PtrSize, 6759 retOffset: 3 * goarch.PtrSize, 6760 stack: []byte{1, 0, 1}, 6761 gc: []byte{1, 0, 1}, 6762 }, 6763 { 6764 typ: ValueOf(func(a uintptr) {}).Type(), 6765 size: goarch.PtrSize, 6766 argsize: goarch.PtrSize, 6767 retOffset: goarch.PtrSize, 6768 stack: []byte{}, 6769 gc: []byte{}, 6770 }, 6771 { 6772 typ: ValueOf(func() uintptr { return 0 }).Type(), 6773 size: goarch.PtrSize, 6774 argsize: 0, 6775 retOffset: 0, 6776 stack: []byte{}, 6777 gc: []byte{}, 6778 }, 6779 { 6780 rcvr: ValueOf(uintptr(0)).Type(), 6781 typ: ValueOf(func(a uintptr) {}).Type(), 6782 size: 2 * goarch.PtrSize, 6783 argsize: 2 * goarch.PtrSize, 6784 retOffset: 2 * goarch.PtrSize, 6785 stack: []byte{1}, 6786 gc: []byte{1}, 6787 // Note: this one is tricky, as the receiver is not a pointer. But we 6788 // pass the receiver by reference to the autogenerated pointer-receiver 6789 // version of the function. 6790 }, 6791 // TODO(mknyszek): Add tests for non-zero register count. 6792 } 6793 for _, lt := range tests { 6794 name := lt.typ.String() 6795 if lt.rcvr != nil { 6796 name = lt.rcvr.String() + "." + name 6797 } 6798 t.Run(name, func(t *testing.T) { 6799 defer SetArgRegs(SetArgRegs(lt.intRegs, lt.floatRegs, lt.floatRegSize)) 6800 6801 typ, argsize, retOffset, stack, gc, inRegs, outRegs, ptrs := FuncLayout(lt.typ, lt.rcvr) 6802 if typ.Size() != lt.size { 6803 t.Errorf("funcLayout(%v, %v).size=%d, want %d", lt.typ, lt.rcvr, typ.Size(), lt.size) 6804 } 6805 if argsize != lt.argsize { 6806 t.Errorf("funcLayout(%v, %v).argsize=%d, want %d", lt.typ, lt.rcvr, argsize, lt.argsize) 6807 } 6808 if retOffset != lt.retOffset { 6809 t.Errorf("funcLayout(%v, %v).retOffset=%d, want %d", lt.typ, lt.rcvr, retOffset, lt.retOffset) 6810 } 6811 if !bytes.Equal(stack, lt.stack) { 6812 t.Errorf("funcLayout(%v, %v).stack=%v, want %v", lt.typ, lt.rcvr, stack, lt.stack) 6813 } 6814 if !bytes.Equal(gc, lt.gc) { 6815 t.Errorf("funcLayout(%v, %v).gc=%v, want %v", lt.typ, lt.rcvr, gc, lt.gc) 6816 } 6817 if !bytes.Equal(inRegs, lt.inRegs) { 6818 t.Errorf("funcLayout(%v, %v).inRegs=%v, want %v", lt.typ, lt.rcvr, inRegs, lt.inRegs) 6819 } 6820 if !bytes.Equal(outRegs, lt.outRegs) { 6821 t.Errorf("funcLayout(%v, %v).outRegs=%v, want %v", lt.typ, lt.rcvr, outRegs, lt.outRegs) 6822 } 6823 if ptrs && len(stack) == 0 || !ptrs && len(stack) > 0 { 6824 t.Errorf("funcLayout(%v, %v) pointers flag=%v, want %v", lt.typ, lt.rcvr, ptrs, !ptrs) 6825 } 6826 }) 6827 } 6828} 6829 6830func verifyGCBits(t *testing.T, typ Type, bits []byte) { 6831 heapBits := GCBits(New(typ).Interface()) 6832 if !bytes.Equal(heapBits, bits) { 6833 _, _, line, _ := runtime.Caller(1) 6834 t.Errorf("line %d: heapBits incorrect for %v\nhave %v\nwant %v", line, typ, heapBits, bits) 6835 } 6836} 6837 6838func verifyGCBitsSlice(t *testing.T, typ Type, cap int, bits []byte) { 6839 // Creating a slice causes the runtime to repeat a bitmap, 6840 // which exercises a different path from making the compiler 6841 // repeat a bitmap for a small array or executing a repeat in 6842 // a GC program. 6843 val := MakeSlice(typ, 0, cap) 6844 data := NewAt(ArrayOf(cap, typ), val.UnsafePointer()) 6845 heapBits := GCBits(data.Interface()) 6846 // Repeat the bitmap for the slice size, trimming scalars in 6847 // the last element. 6848 bits = rep(cap, bits) 6849 for len(bits) > 0 && bits[len(bits)-1] == 0 { 6850 bits = bits[:len(bits)-1] 6851 } 6852 if !bytes.Equal(heapBits, bits) { 6853 t.Errorf("heapBits incorrect for make(%v, 0, %v)\nhave %v\nwant %v", typ, cap, heapBits, bits) 6854 } 6855} 6856 6857func TestGCBits(t *testing.T) { 6858 verifyGCBits(t, TypeOf((*byte)(nil)), []byte{1}) 6859 6860 // Building blocks for types seen by the compiler (like [2]Xscalar). 6861 // The compiler will create the type structures for the derived types, 6862 // including their GC metadata. 6863 type Xscalar struct{ x uintptr } 6864 type Xptr struct{ x *byte } 6865 type Xptrscalar struct { 6866 *byte 6867 uintptr 6868 } 6869 type Xscalarptr struct { 6870 uintptr 6871 *byte 6872 } 6873 type Xbigptrscalar struct { 6874 _ [100]*byte 6875 _ [100]uintptr 6876 } 6877 6878 var Tscalar, Tint64, Tptr, Tscalarptr, Tptrscalar, Tbigptrscalar Type 6879 { 6880 // Building blocks for types constructed by reflect. 6881 // This code is in a separate block so that code below 6882 // cannot accidentally refer to these. 6883 // The compiler must NOT see types derived from these 6884 // (for example, [2]Scalar must NOT appear in the program), 6885 // or else reflect will use it instead of having to construct one. 6886 // The goal is to test the construction. 6887 type Scalar struct{ x uintptr } 6888 type Ptr struct{ x *byte } 6889 type Ptrscalar struct { 6890 *byte 6891 uintptr 6892 } 6893 type Scalarptr struct { 6894 uintptr 6895 *byte 6896 } 6897 type Bigptrscalar struct { 6898 _ [100]*byte 6899 _ [100]uintptr 6900 } 6901 type Int64 int64 6902 Tscalar = TypeOf(Scalar{}) 6903 Tint64 = TypeOf(Int64(0)) 6904 Tptr = TypeOf(Ptr{}) 6905 Tscalarptr = TypeOf(Scalarptr{}) 6906 Tptrscalar = TypeOf(Ptrscalar{}) 6907 Tbigptrscalar = TypeOf(Bigptrscalar{}) 6908 } 6909 6910 empty := []byte{} 6911 6912 verifyGCBits(t, TypeOf(Xscalar{}), empty) 6913 verifyGCBits(t, Tscalar, empty) 6914 verifyGCBits(t, TypeOf(Xptr{}), lit(1)) 6915 verifyGCBits(t, Tptr, lit(1)) 6916 verifyGCBits(t, TypeOf(Xscalarptr{}), lit(0, 1)) 6917 verifyGCBits(t, Tscalarptr, lit(0, 1)) 6918 verifyGCBits(t, TypeOf(Xptrscalar{}), lit(1)) 6919 verifyGCBits(t, Tptrscalar, lit(1)) 6920 6921 verifyGCBits(t, TypeOf([0]Xptr{}), empty) 6922 verifyGCBits(t, ArrayOf(0, Tptr), empty) 6923 verifyGCBits(t, TypeOf([1]Xptrscalar{}), lit(1)) 6924 verifyGCBits(t, ArrayOf(1, Tptrscalar), lit(1)) 6925 verifyGCBits(t, TypeOf([2]Xscalar{}), empty) 6926 verifyGCBits(t, ArrayOf(2, Tscalar), empty) 6927 verifyGCBits(t, TypeOf([10000]Xscalar{}), empty) 6928 verifyGCBits(t, ArrayOf(10000, Tscalar), empty) 6929 verifyGCBits(t, TypeOf([2]Xptr{}), lit(1, 1)) 6930 verifyGCBits(t, ArrayOf(2, Tptr), lit(1, 1)) 6931 verifyGCBits(t, TypeOf([10000]Xptr{}), rep(10000, lit(1))) 6932 verifyGCBits(t, ArrayOf(10000, Tptr), rep(10000, lit(1))) 6933 verifyGCBits(t, TypeOf([2]Xscalarptr{}), lit(0, 1, 0, 1)) 6934 verifyGCBits(t, ArrayOf(2, Tscalarptr), lit(0, 1, 0, 1)) 6935 verifyGCBits(t, TypeOf([10000]Xscalarptr{}), rep(10000, lit(0, 1))) 6936 verifyGCBits(t, ArrayOf(10000, Tscalarptr), rep(10000, lit(0, 1))) 6937 verifyGCBits(t, TypeOf([2]Xptrscalar{}), lit(1, 0, 1)) 6938 verifyGCBits(t, ArrayOf(2, Tptrscalar), lit(1, 0, 1)) 6939 verifyGCBits(t, TypeOf([10000]Xptrscalar{}), rep(10000, lit(1, 0))) 6940 verifyGCBits(t, ArrayOf(10000, Tptrscalar), rep(10000, lit(1, 0))) 6941 verifyGCBits(t, TypeOf([1][10000]Xptrscalar{}), rep(10000, lit(1, 0))) 6942 verifyGCBits(t, ArrayOf(1, ArrayOf(10000, Tptrscalar)), rep(10000, lit(1, 0))) 6943 verifyGCBits(t, TypeOf([2][10000]Xptrscalar{}), rep(2*10000, lit(1, 0))) 6944 verifyGCBits(t, ArrayOf(2, ArrayOf(10000, Tptrscalar)), rep(2*10000, lit(1, 0))) 6945 verifyGCBits(t, TypeOf([4]Xbigptrscalar{}), join(rep(3, join(rep(100, lit(1)), rep(100, lit(0)))), rep(100, lit(1)))) 6946 verifyGCBits(t, ArrayOf(4, Tbigptrscalar), join(rep(3, join(rep(100, lit(1)), rep(100, lit(0)))), rep(100, lit(1)))) 6947 6948 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 0, empty) 6949 verifyGCBitsSlice(t, SliceOf(Tptr), 0, empty) 6950 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 1, lit(1)) 6951 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 1, lit(1)) 6952 verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 2, lit(0)) 6953 verifyGCBitsSlice(t, SliceOf(Tscalar), 2, lit(0)) 6954 verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 10000, lit(0)) 6955 verifyGCBitsSlice(t, SliceOf(Tscalar), 10000, lit(0)) 6956 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 2, lit(1)) 6957 verifyGCBitsSlice(t, SliceOf(Tptr), 2, lit(1)) 6958 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 10000, lit(1)) 6959 verifyGCBitsSlice(t, SliceOf(Tptr), 10000, lit(1)) 6960 verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 2, lit(0, 1)) 6961 verifyGCBitsSlice(t, SliceOf(Tscalarptr), 2, lit(0, 1)) 6962 verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 10000, lit(0, 1)) 6963 verifyGCBitsSlice(t, SliceOf(Tscalarptr), 10000, lit(0, 1)) 6964 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 2, lit(1, 0)) 6965 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 2, lit(1, 0)) 6966 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 10000, lit(1, 0)) 6967 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 10000, lit(1, 0)) 6968 verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 1, rep(10000, lit(1, 0))) 6969 verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 1, rep(10000, lit(1, 0))) 6970 verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 2, rep(10000, lit(1, 0))) 6971 verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 2, rep(10000, lit(1, 0))) 6972 verifyGCBitsSlice(t, TypeOf([]Xbigptrscalar{}), 4, join(rep(100, lit(1)), rep(100, lit(0)))) 6973 verifyGCBitsSlice(t, SliceOf(Tbigptrscalar), 4, join(rep(100, lit(1)), rep(100, lit(0)))) 6974 6975 verifyGCBits(t, TypeOf((chan [100]Xscalar)(nil)), lit(1)) 6976 verifyGCBits(t, ChanOf(BothDir, ArrayOf(100, Tscalar)), lit(1)) 6977 6978 verifyGCBits(t, TypeOf((func([10000]Xscalarptr))(nil)), lit(1)) 6979 verifyGCBits(t, FuncOf([]Type{ArrayOf(10000, Tscalarptr)}, nil, false), lit(1)) 6980 6981 verifyGCBits(t, TypeOf((map[[10000]Xscalarptr]Xscalar)(nil)), lit(1)) 6982 verifyGCBits(t, MapOf(ArrayOf(10000, Tscalarptr), Tscalar), lit(1)) 6983 6984 verifyGCBits(t, TypeOf((*[10000]Xscalar)(nil)), lit(1)) 6985 verifyGCBits(t, PointerTo(ArrayOf(10000, Tscalar)), lit(1)) 6986 6987 verifyGCBits(t, TypeOf(([][10000]Xscalar)(nil)), lit(1)) 6988 verifyGCBits(t, SliceOf(ArrayOf(10000, Tscalar)), lit(1)) 6989 6990 hdr := make([]byte, 8/goarch.PtrSize) 6991 6992 verifyMapBucket := func(t *testing.T, k, e Type, m any, want []byte) { 6993 verifyGCBits(t, MapBucketOf(k, e), want) 6994 verifyGCBits(t, CachedBucketOf(TypeOf(m)), want) 6995 } 6996 verifyMapBucket(t, 6997 Tscalar, Tptr, 6998 map[Xscalar]Xptr(nil), 6999 join(hdr, rep(8, lit(0)), rep(8, lit(1)), lit(1))) 7000 verifyMapBucket(t, 7001 Tscalarptr, Tptr, 7002 map[Xscalarptr]Xptr(nil), 7003 join(hdr, rep(8, lit(0, 1)), rep(8, lit(1)), lit(1))) 7004 verifyMapBucket(t, Tint64, Tptr, 7005 map[int64]Xptr(nil), 7006 join(hdr, rep(8, rep(8/goarch.PtrSize, lit(0))), rep(8, lit(1)), lit(1))) 7007 verifyMapBucket(t, 7008 Tscalar, Tscalar, 7009 map[Xscalar]Xscalar(nil), 7010 empty) 7011 verifyMapBucket(t, 7012 ArrayOf(2, Tscalarptr), ArrayOf(3, Tptrscalar), 7013 map[[2]Xscalarptr][3]Xptrscalar(nil), 7014 join(hdr, rep(8*2, lit(0, 1)), rep(8*3, lit(1, 0)), lit(1))) 7015 verifyMapBucket(t, 7016 ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar), 7017 map[[64 / goarch.PtrSize]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil), 7018 join(hdr, rep(8*64/goarch.PtrSize, lit(0, 1)), rep(8*64/goarch.PtrSize, lit(1, 0)), lit(1))) 7019 verifyMapBucket(t, 7020 ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar), 7021 map[[64/goarch.PtrSize + 1]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil), 7022 join(hdr, rep(8, lit(1)), rep(8*64/goarch.PtrSize, lit(1, 0)), lit(1))) 7023 verifyMapBucket(t, 7024 ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar), 7025 map[[64 / goarch.PtrSize]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil), 7026 join(hdr, rep(8*64/goarch.PtrSize, lit(0, 1)), rep(8, lit(1)), lit(1))) 7027 verifyMapBucket(t, 7028 ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar), 7029 map[[64/goarch.PtrSize + 1]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil), 7030 join(hdr, rep(8, lit(1)), rep(8, lit(1)), lit(1))) 7031} 7032 7033func rep(n int, b []byte) []byte { return bytes.Repeat(b, n) } 7034func join(b ...[]byte) []byte { return bytes.Join(b, nil) } 7035func lit(x ...byte) []byte { return x } 7036 7037func TestTypeOfTypeOf(t *testing.T) { 7038 // Check that all the type constructors return concrete *rtype implementations. 7039 // It's difficult to test directly because the reflect package is only at arm's length. 7040 // The easiest thing to do is just call a function that crashes if it doesn't get an *rtype. 7041 check := func(name string, typ Type) { 7042 if underlying := TypeOf(typ).String(); underlying != "*reflect.rtype" { 7043 t.Errorf("%v returned %v, not *reflect.rtype", name, underlying) 7044 } 7045 } 7046 7047 type T struct{ int } 7048 check("TypeOf", TypeOf(T{})) 7049 7050 check("ArrayOf", ArrayOf(10, TypeOf(T{}))) 7051 check("ChanOf", ChanOf(BothDir, TypeOf(T{}))) 7052 check("FuncOf", FuncOf([]Type{TypeOf(T{})}, nil, false)) 7053 check("MapOf", MapOf(TypeOf(T{}), TypeOf(T{}))) 7054 check("PtrTo", PointerTo(TypeOf(T{}))) 7055 check("SliceOf", SliceOf(TypeOf(T{}))) 7056} 7057 7058type XM struct{ _ bool } 7059 7060func (*XM) String() string { return "" } 7061 7062func TestPtrToMethods(t *testing.T) { 7063 var y struct{ XM } 7064 yp := New(TypeOf(y)).Interface() 7065 _, ok := yp.(fmt.Stringer) 7066 if !ok { 7067 t.Fatal("does not implement Stringer, but should") 7068 } 7069} 7070 7071func TestMapAlloc(t *testing.T) { 7072 m := ValueOf(make(map[int]int, 10)) 7073 k := ValueOf(5) 7074 v := ValueOf(7) 7075 allocs := testing.AllocsPerRun(100, func() { 7076 m.SetMapIndex(k, v) 7077 }) 7078 if allocs > 0.5 { 7079 t.Errorf("allocs per map assignment: want 0 got %f", allocs) 7080 } 7081 7082 const size = 1000 7083 tmp := 0 7084 val := ValueOf(&tmp).Elem() 7085 allocs = testing.AllocsPerRun(100, func() { 7086 mv := MakeMapWithSize(TypeOf(map[int]int{}), size) 7087 // Only adding half of the capacity to not trigger re-allocations due too many overloaded buckets. 7088 for i := 0; i < size/2; i++ { 7089 val.SetInt(int64(i)) 7090 mv.SetMapIndex(val, val) 7091 } 7092 }) 7093 if allocs > 10 { 7094 t.Errorf("allocs per map assignment: want at most 10 got %f", allocs) 7095 } 7096 // Empirical testing shows that with capacity hint single run will trigger 3 allocations and without 91. I set 7097 // the threshold to 10, to not make it overly brittle if something changes in the initial allocation of the 7098 // map, but to still catch a regression where we keep re-allocating in the hashmap as new entries are added. 7099} 7100 7101func TestChanAlloc(t *testing.T) { 7102 // Note: for a chan int, the return Value must be allocated, so we 7103 // use a chan *int instead. 7104 c := ValueOf(make(chan *int, 1)) 7105 v := ValueOf(new(int)) 7106 allocs := testing.AllocsPerRun(100, func() { 7107 c.Send(v) 7108 _, _ = c.Recv() 7109 }) 7110 if allocs < 0.5 || allocs > 1.5 { 7111 t.Errorf("allocs per chan send/recv: want 1 got %f", allocs) 7112 } 7113 // Note: there is one allocation in reflect.recv which seems to be 7114 // a limitation of escape analysis. If that is ever fixed the 7115 // allocs < 0.5 condition will trigger and this test should be fixed. 7116} 7117 7118type TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678 int 7119 7120type nameTest struct { 7121 v any 7122 want string 7123} 7124 7125var nameTests = []nameTest{ 7126 {(*int32)(nil), "int32"}, 7127 {(*D1)(nil), "D1"}, 7128 {(*[]D1)(nil), ""}, 7129 {(*chan D1)(nil), ""}, 7130 {(*func() D1)(nil), ""}, 7131 {(*<-chan D1)(nil), ""}, 7132 {(*chan<- D1)(nil), ""}, 7133 {(*any)(nil), ""}, 7134 {(*interface { 7135 F() 7136 })(nil), ""}, 7137 {(*TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678)(nil), "TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678"}, 7138} 7139 7140func TestNames(t *testing.T) { 7141 for _, test := range nameTests { 7142 typ := TypeOf(test.v).Elem() 7143 if got := typ.Name(); got != test.want { 7144 t.Errorf("%v Name()=%q, want %q", typ, got, test.want) 7145 } 7146 } 7147} 7148 7149func TestExported(t *testing.T) { 7150 type ΦExported struct{} 7151 type φUnexported struct{} 7152 type BigP *big 7153 type P int 7154 type p *P 7155 type P2 p 7156 type p3 p 7157 7158 type exportTest struct { 7159 v any 7160 want bool 7161 } 7162 exportTests := []exportTest{ 7163 {D1{}, true}, 7164 {(*D1)(nil), true}, 7165 {big{}, false}, 7166 {(*big)(nil), false}, 7167 {(BigP)(nil), true}, 7168 {(*BigP)(nil), true}, 7169 {ΦExported{}, true}, 7170 {φUnexported{}, false}, 7171 {P(0), true}, 7172 {(p)(nil), false}, 7173 {(P2)(nil), true}, 7174 {(p3)(nil), false}, 7175 } 7176 7177 for i, test := range exportTests { 7178 typ := TypeOf(test.v) 7179 if got := IsExported(typ); got != test.want { 7180 t.Errorf("%d: %s exported=%v, want %v", i, typ.Name(), got, test.want) 7181 } 7182 } 7183} 7184 7185func TestTypeStrings(t *testing.T) { 7186 type stringTest struct { 7187 typ Type 7188 want string 7189 } 7190 stringTests := []stringTest{ 7191 {TypeOf(func(int) {}), "func(int)"}, 7192 {FuncOf([]Type{TypeOf(int(0))}, nil, false), "func(int)"}, 7193 {TypeOf(XM{}), "reflect_test.XM"}, 7194 {TypeOf(new(XM)), "*reflect_test.XM"}, 7195 {TypeOf(new(XM).String), "func() string"}, 7196 {TypeOf(new(XM)).Method(0).Type, "func(*reflect_test.XM) string"}, 7197 {ChanOf(3, TypeOf(XM{})), "chan reflect_test.XM"}, 7198 {MapOf(TypeOf(int(0)), TypeOf(XM{})), "map[int]reflect_test.XM"}, 7199 {ArrayOf(3, TypeOf(XM{})), "[3]reflect_test.XM"}, 7200 {ArrayOf(3, TypeOf(struct{}{})), "[3]struct {}"}, 7201 } 7202 7203 for i, test := range stringTests { 7204 if got, want := test.typ.String(), test.want; got != want { 7205 t.Errorf("type %d String()=%q, want %q", i, got, want) 7206 } 7207 } 7208} 7209 7210func TestOffsetLock(t *testing.T) { 7211 var wg sync.WaitGroup 7212 for i := 0; i < 4; i++ { 7213 i := i 7214 wg.Add(1) 7215 go func() { 7216 for j := 0; j < 50; j++ { 7217 ResolveReflectName(fmt.Sprintf("OffsetLockName:%d:%d", i, j)) 7218 } 7219 wg.Done() 7220 }() 7221 } 7222 wg.Wait() 7223} 7224 7225func BenchmarkNew(b *testing.B) { 7226 v := TypeOf(XM{}) 7227 b.RunParallel(func(pb *testing.PB) { 7228 for pb.Next() { 7229 New(v) 7230 } 7231 }) 7232} 7233 7234func BenchmarkMap(b *testing.B) { 7235 type V *int 7236 value := ValueOf((V)(nil)) 7237 stringKeys := []string{} 7238 mapOfStrings := map[string]V{} 7239 uint64Keys := []uint64{} 7240 mapOfUint64s := map[uint64]V{} 7241 for i := 0; i < 100; i++ { 7242 stringKey := fmt.Sprintf("key%d", i) 7243 stringKeys = append(stringKeys, stringKey) 7244 mapOfStrings[stringKey] = nil 7245 7246 uint64Key := uint64(i) 7247 uint64Keys = append(uint64Keys, uint64Key) 7248 mapOfUint64s[uint64Key] = nil 7249 } 7250 7251 tests := []struct { 7252 label string 7253 m, keys, value Value 7254 }{ 7255 {"StringKeys", ValueOf(mapOfStrings), ValueOf(stringKeys), value}, 7256 {"Uint64Keys", ValueOf(mapOfUint64s), ValueOf(uint64Keys), value}, 7257 } 7258 7259 for _, tt := range tests { 7260 b.Run(tt.label, func(b *testing.B) { 7261 b.Run("MapIndex", func(b *testing.B) { 7262 b.ReportAllocs() 7263 for i := 0; i < b.N; i++ { 7264 for j := tt.keys.Len() - 1; j >= 0; j-- { 7265 tt.m.MapIndex(tt.keys.Index(j)) 7266 } 7267 } 7268 }) 7269 b.Run("SetMapIndex", func(b *testing.B) { 7270 b.ReportAllocs() 7271 for i := 0; i < b.N; i++ { 7272 for j := tt.keys.Len() - 1; j >= 0; j-- { 7273 tt.m.SetMapIndex(tt.keys.Index(j), tt.value) 7274 } 7275 } 7276 }) 7277 }) 7278 } 7279} 7280 7281func TestSwapper(t *testing.T) { 7282 type I int 7283 var a, b, c I 7284 type pair struct { 7285 x, y int 7286 } 7287 type pairPtr struct { 7288 x, y int 7289 p *I 7290 } 7291 type S string 7292 7293 tests := []struct { 7294 in any 7295 i, j int 7296 want any 7297 }{ 7298 { 7299 in: []int{1, 20, 300}, 7300 i: 0, 7301 j: 2, 7302 want: []int{300, 20, 1}, 7303 }, 7304 { 7305 in: []uintptr{1, 20, 300}, 7306 i: 0, 7307 j: 2, 7308 want: []uintptr{300, 20, 1}, 7309 }, 7310 { 7311 in: []int16{1, 20, 300}, 7312 i: 0, 7313 j: 2, 7314 want: []int16{300, 20, 1}, 7315 }, 7316 { 7317 in: []int8{1, 20, 100}, 7318 i: 0, 7319 j: 2, 7320 want: []int8{100, 20, 1}, 7321 }, 7322 { 7323 in: []*I{&a, &b, &c}, 7324 i: 0, 7325 j: 2, 7326 want: []*I{&c, &b, &a}, 7327 }, 7328 { 7329 in: []string{"eric", "sergey", "larry"}, 7330 i: 0, 7331 j: 2, 7332 want: []string{"larry", "sergey", "eric"}, 7333 }, 7334 { 7335 in: []S{"eric", "sergey", "larry"}, 7336 i: 0, 7337 j: 2, 7338 want: []S{"larry", "sergey", "eric"}, 7339 }, 7340 { 7341 in: []pair{{1, 2}, {3, 4}, {5, 6}}, 7342 i: 0, 7343 j: 2, 7344 want: []pair{{5, 6}, {3, 4}, {1, 2}}, 7345 }, 7346 { 7347 in: []pairPtr{{1, 2, &a}, {3, 4, &b}, {5, 6, &c}}, 7348 i: 0, 7349 j: 2, 7350 want: []pairPtr{{5, 6, &c}, {3, 4, &b}, {1, 2, &a}}, 7351 }, 7352 } 7353 7354 for i, tt := range tests { 7355 inStr := fmt.Sprint(tt.in) 7356 Swapper(tt.in)(tt.i, tt.j) 7357 if !DeepEqual(tt.in, tt.want) { 7358 t.Errorf("%d. swapping %v and %v of %v = %v; want %v", i, tt.i, tt.j, inStr, tt.in, tt.want) 7359 } 7360 } 7361} 7362 7363// TestUnaddressableField tests that the reflect package will not allow 7364// a type from another package to be used as a named type with an 7365// unexported field. 7366// 7367// This ensures that unexported fields cannot be modified by other packages. 7368func TestUnaddressableField(t *testing.T) { 7369 var b Buffer // type defined in reflect, a different package 7370 var localBuffer struct { 7371 buf []byte 7372 } 7373 lv := ValueOf(&localBuffer).Elem() 7374 rv := ValueOf(b) 7375 shouldPanic("Set", func() { 7376 lv.Set(rv) 7377 }) 7378} 7379 7380type Tint int 7381 7382type Tint2 = Tint 7383 7384type Talias1 struct { 7385 byte 7386 uint8 7387 int 7388 int32 7389 rune 7390} 7391 7392type Talias2 struct { 7393 Tint 7394 Tint2 7395} 7396 7397func TestAliasNames(t *testing.T) { 7398 t1 := Talias1{byte: 1, uint8: 2, int: 3, int32: 4, rune: 5} 7399 out := fmt.Sprintf("%#v", t1) 7400 want := "reflect_test.Talias1{byte:0x1, uint8:0x2, int:3, int32:4, rune:5}" 7401 if out != want { 7402 t.Errorf("Talias1 print:\nhave: %s\nwant: %s", out, want) 7403 } 7404 7405 t2 := Talias2{Tint: 1, Tint2: 2} 7406 out = fmt.Sprintf("%#v", t2) 7407 want = "reflect_test.Talias2{Tint:1, Tint2:2}" 7408 if out != want { 7409 t.Errorf("Talias2 print:\nhave: %s\nwant: %s", out, want) 7410 } 7411} 7412 7413func TestIssue22031(t *testing.T) { 7414 type s []struct{ C int } 7415 7416 type t1 struct{ s } 7417 type t2 struct{ f s } 7418 7419 tests := []Value{ 7420 ValueOf(t1{s{{}}}).Field(0).Index(0).Field(0), 7421 ValueOf(t2{s{{}}}).Field(0).Index(0).Field(0), 7422 } 7423 7424 for i, test := range tests { 7425 if test.CanSet() { 7426 t.Errorf("%d: CanSet: got true, want false", i) 7427 } 7428 } 7429} 7430 7431type NonExportedFirst int 7432 7433func (i NonExportedFirst) ΦExported() {} 7434func (i NonExportedFirst) nonexported() int { panic("wrong") } 7435 7436func TestIssue22073(t *testing.T) { 7437 m := ValueOf(NonExportedFirst(0)).Method(0) 7438 7439 if got := m.Type().NumOut(); got != 0 { 7440 t.Errorf("NumOut: got %v, want 0", got) 7441 } 7442 7443 // Shouldn't panic. 7444 m.Call(nil) 7445} 7446 7447func TestMapIterNonEmptyMap(t *testing.T) { 7448 m := map[string]int{"one": 1, "two": 2, "three": 3} 7449 iter := ValueOf(m).MapRange() 7450 if got, want := iterateToString(iter), `[one: 1, three: 3, two: 2]`; got != want { 7451 t.Errorf("iterator returned %s (after sorting), want %s", got, want) 7452 } 7453} 7454 7455func TestMapIterNilMap(t *testing.T) { 7456 var m map[string]int 7457 iter := ValueOf(m).MapRange() 7458 if got, want := iterateToString(iter), `[]`; got != want { 7459 t.Errorf("non-empty result iteratoring nil map: %s", got) 7460 } 7461} 7462 7463func TestMapIterReset(t *testing.T) { 7464 iter := new(MapIter) 7465 7466 // Use of zero iterator should panic. 7467 func() { 7468 defer func() { recover() }() 7469 iter.Next() 7470 t.Error("Next did not panic") 7471 }() 7472 7473 // Reset to new Map should work. 7474 m := map[string]int{"one": 1, "two": 2, "three": 3} 7475 iter.Reset(ValueOf(m)) 7476 if got, want := iterateToString(iter), `[one: 1, three: 3, two: 2]`; got != want { 7477 t.Errorf("iterator returned %s (after sorting), want %s", got, want) 7478 } 7479 7480 // Reset to Zero value should work, but iterating over it should panic. 7481 iter.Reset(Value{}) 7482 func() { 7483 defer func() { recover() }() 7484 iter.Next() 7485 t.Error("Next did not panic") 7486 }() 7487 7488 // Reset to a different Map with different types should work. 7489 m2 := map[int]string{1: "one", 2: "two", 3: "three"} 7490 iter.Reset(ValueOf(m2)) 7491 if got, want := iterateToString(iter), `[1: one, 2: two, 3: three]`; got != want { 7492 t.Errorf("iterator returned %s (after sorting), want %s", got, want) 7493 } 7494 7495 // Check that Reset, Next, and SetKey/SetValue play nicely together. 7496 m3 := map[uint64]uint64{ 7497 1 << 0: 1 << 1, 7498 1 << 1: 1 << 2, 7499 1 << 2: 1 << 3, 7500 } 7501 kv := New(TypeOf(uint64(0))).Elem() 7502 for i := 0; i < 5; i++ { 7503 var seenk, seenv uint64 7504 iter.Reset(ValueOf(m3)) 7505 for iter.Next() { 7506 kv.SetIterKey(iter) 7507 seenk ^= kv.Uint() 7508 kv.SetIterValue(iter) 7509 seenv ^= kv.Uint() 7510 } 7511 if seenk != 0b111 { 7512 t.Errorf("iteration yielded keys %b, want %b", seenk, 0b111) 7513 } 7514 if seenv != 0b1110 { 7515 t.Errorf("iteration yielded values %b, want %b", seenv, 0b1110) 7516 } 7517 } 7518 7519 // Reset should not allocate. 7520 n := int(testing.AllocsPerRun(10, func() { 7521 iter.Reset(ValueOf(m2)) 7522 iter.Reset(Value{}) 7523 })) 7524 if n > 0 { 7525 t.Errorf("MapIter.Reset allocated %d times", n) 7526 } 7527} 7528 7529func TestMapIterSafety(t *testing.T) { 7530 // Using a zero MapIter causes a panic, but not a crash. 7531 func() { 7532 defer func() { recover() }() 7533 new(MapIter).Key() 7534 t.Fatal("Key did not panic") 7535 }() 7536 func() { 7537 defer func() { recover() }() 7538 new(MapIter).Value() 7539 t.Fatal("Value did not panic") 7540 }() 7541 func() { 7542 defer func() { recover() }() 7543 new(MapIter).Next() 7544 t.Fatal("Next did not panic") 7545 }() 7546 7547 // Calling Key/Value on a MapIter before Next 7548 // causes a panic, but not a crash. 7549 var m map[string]int 7550 iter := ValueOf(m).MapRange() 7551 7552 func() { 7553 defer func() { recover() }() 7554 iter.Key() 7555 t.Fatal("Key did not panic") 7556 }() 7557 func() { 7558 defer func() { recover() }() 7559 iter.Value() 7560 t.Fatal("Value did not panic") 7561 }() 7562 7563 // Calling Next, Key, or Value on an exhausted iterator 7564 // causes a panic, but not a crash. 7565 iter.Next() // -> false 7566 func() { 7567 defer func() { recover() }() 7568 iter.Key() 7569 t.Fatal("Key did not panic") 7570 }() 7571 func() { 7572 defer func() { recover() }() 7573 iter.Value() 7574 t.Fatal("Value did not panic") 7575 }() 7576 func() { 7577 defer func() { recover() }() 7578 iter.Next() 7579 t.Fatal("Next did not panic") 7580 }() 7581} 7582 7583func TestMapIterNext(t *testing.T) { 7584 // The first call to Next should reflect any 7585 // insertions to the map since the iterator was created. 7586 m := map[string]int{} 7587 iter := ValueOf(m).MapRange() 7588 m["one"] = 1 7589 if got, want := iterateToString(iter), `[one: 1]`; got != want { 7590 t.Errorf("iterator returned deleted elements: got %s, want %s", got, want) 7591 } 7592} 7593 7594func BenchmarkMapIterNext(b *testing.B) { 7595 m := ValueOf(map[string]int{"a": 0, "b": 1, "c": 2, "d": 3}) 7596 it := m.MapRange() 7597 for i := 0; i < b.N; i++ { 7598 for it.Next() { 7599 } 7600 it.Reset(m) 7601 } 7602} 7603 7604func TestMapIterDelete0(t *testing.T) { 7605 // Delete all elements before first iteration. 7606 m := map[string]int{"one": 1, "two": 2, "three": 3} 7607 iter := ValueOf(m).MapRange() 7608 delete(m, "one") 7609 delete(m, "two") 7610 delete(m, "three") 7611 if got, want := iterateToString(iter), `[]`; got != want { 7612 t.Errorf("iterator returned deleted elements: got %s, want %s", got, want) 7613 } 7614} 7615 7616func TestMapIterDelete1(t *testing.T) { 7617 // Delete all elements after first iteration. 7618 m := map[string]int{"one": 1, "two": 2, "three": 3} 7619 iter := ValueOf(m).MapRange() 7620 var got []string 7621 for iter.Next() { 7622 got = append(got, fmt.Sprint(iter.Key(), iter.Value())) 7623 delete(m, "one") 7624 delete(m, "two") 7625 delete(m, "three") 7626 } 7627 if len(got) != 1 { 7628 t.Errorf("iterator returned wrong number of elements: got %d, want 1", len(got)) 7629 } 7630} 7631 7632// iterateToString returns the set of elements 7633// returned by an iterator in readable form. 7634func iterateToString(it *MapIter) string { 7635 var got []string 7636 for it.Next() { 7637 line := fmt.Sprintf("%v: %v", it.Key(), it.Value()) 7638 got = append(got, line) 7639 } 7640 sort.Strings(got) 7641 return "[" + strings.Join(got, ", ") + "]" 7642} 7643 7644func TestConvertibleTo(t *testing.T) { 7645 t1 := ValueOf(example1.MyStruct{}).Type() 7646 t2 := ValueOf(example2.MyStruct{}).Type() 7647 7648 // Shouldn't raise stack overflow 7649 if t1.ConvertibleTo(t2) { 7650 t.Fatalf("(%s).ConvertibleTo(%s) = true, want false", t1, t2) 7651 } 7652 7653 t3 := ValueOf([]example1.MyStruct{}).Type() 7654 t4 := ValueOf([]example2.MyStruct{}).Type() 7655 7656 if t3.ConvertibleTo(t4) { 7657 t.Fatalf("(%s).ConvertibleTo(%s) = true, want false", t3, t4) 7658 } 7659} 7660 7661func TestSetIter(t *testing.T) { 7662 data := map[string]int{ 7663 "foo": 1, 7664 "bar": 2, 7665 "baz": 3, 7666 } 7667 7668 m := ValueOf(data) 7669 i := m.MapRange() 7670 k := New(TypeOf("")).Elem() 7671 v := New(TypeOf(0)).Elem() 7672 shouldPanic("Value.SetIterKey called before Next", func() { 7673 k.SetIterKey(i) 7674 }) 7675 shouldPanic("Value.SetIterValue called before Next", func() { 7676 v.SetIterValue(i) 7677 }) 7678 data2 := map[string]int{} 7679 for i.Next() { 7680 k.SetIterKey(i) 7681 v.SetIterValue(i) 7682 data2[k.Interface().(string)] = v.Interface().(int) 7683 } 7684 if !DeepEqual(data, data2) { 7685 t.Errorf("maps not equal, got %v want %v", data2, data) 7686 } 7687 shouldPanic("Value.SetIterKey called on exhausted iterator", func() { 7688 k.SetIterKey(i) 7689 }) 7690 shouldPanic("Value.SetIterValue called on exhausted iterator", func() { 7691 v.SetIterValue(i) 7692 }) 7693 7694 i.Reset(m) 7695 i.Next() 7696 shouldPanic("Value.SetIterKey using unaddressable value", func() { 7697 ValueOf("").SetIterKey(i) 7698 }) 7699 shouldPanic("Value.SetIterValue using unaddressable value", func() { 7700 ValueOf(0).SetIterValue(i) 7701 }) 7702 shouldPanic("value of type string is not assignable to type int", func() { 7703 New(TypeOf(0)).Elem().SetIterKey(i) 7704 }) 7705 shouldPanic("value of type int is not assignable to type string", func() { 7706 New(TypeOf("")).Elem().SetIterValue(i) 7707 }) 7708 7709 // Make sure assignment conversion works. 7710 var x any 7711 y := ValueOf(&x).Elem() 7712 y.SetIterKey(i) 7713 if _, ok := data[x.(string)]; !ok { 7714 t.Errorf("got key %s which is not in map", x) 7715 } 7716 y.SetIterValue(i) 7717 if x.(int) < 1 || x.(int) > 3 { 7718 t.Errorf("got value %d which is not in map", x) 7719 } 7720 7721 // Try some key/value types which are direct interfaces. 7722 a := 88 7723 b := 99 7724 pp := map[*int]*int{ 7725 &a: &b, 7726 } 7727 i = ValueOf(pp).MapRange() 7728 i.Next() 7729 y.SetIterKey(i) 7730 if got := *y.Interface().(*int); got != a { 7731 t.Errorf("pointer incorrect: got %d want %d", got, a) 7732 } 7733 y.SetIterValue(i) 7734 if got := *y.Interface().(*int); got != b { 7735 t.Errorf("pointer incorrect: got %d want %d", got, b) 7736 } 7737} 7738 7739//go:notinheap 7740type nih struct{ x int } 7741 7742var global_nih = nih{x: 7} 7743 7744func TestNotInHeapDeref(t *testing.T) { 7745 // See issue 48399. 7746 v := ValueOf((*nih)(nil)) 7747 v.Elem() 7748 shouldPanic("reflect: call of reflect.Value.Field on zero Value", func() { v.Elem().Field(0) }) 7749 7750 v = ValueOf(&global_nih) 7751 if got := v.Elem().Field(0).Int(); got != 7 { 7752 t.Fatalf("got %d, want 7", got) 7753 } 7754 7755 v = ValueOf((*nih)(unsafe.Pointer(new(int)))) 7756 shouldPanic("reflect: reflect.Value.Elem on an invalid notinheap pointer", func() { v.Elem() }) 7757 shouldPanic("reflect: reflect.Value.Pointer on an invalid notinheap pointer", func() { v.Pointer() }) 7758 shouldPanic("reflect: reflect.Value.UnsafePointer on an invalid notinheap pointer", func() { v.UnsafePointer() }) 7759} 7760 7761func TestMethodCallValueCodePtr(t *testing.T) { 7762 m := ValueOf(Point{}).Method(1) 7763 want := MethodValueCallCodePtr() 7764 if got := uintptr(m.UnsafePointer()); got != want { 7765 t.Errorf("methodValueCall code pointer mismatched, want: %v, got: %v", want, got) 7766 } 7767 if got := m.Pointer(); got != want { 7768 t.Errorf("methodValueCall code pointer mismatched, want: %v, got: %v", want, got) 7769 } 7770} 7771